Every active historical movement which enters an already populated country gives rise there to passive movements, either compression of the native folk followed by amalgamation, or displacement and withdrawal. The latter in some degree attends every territorial encroachment. Only where there is an abundance of free land can a people retire as a whole before the onslaught, and maintain their national or racial solidarity. Thus the Slavs seem largely to have withdrawn before the Germans in the Baltic plains of Europe. The Indians of North and South America retired westward before the advance of the whites from the Atlantic coast. The Cherokee nation, who once had a broad belt of country extending from the Tennessee Valley through South Carolina to the ocean,166 first retracted their frontier to the Appalachian Mountains; in 1816 they were confined to an ever shrinking territory on the middle Tennessee and the southern end of the highlands; in 1818 they began to retire beyond the Mississippi, and in 1828 beyond the western boundary of Arkansas.167 The story of the Shawnees and Delawares is a replica of this.168 In the same way Hottentots and Kaffirs in South Africa are withdrawing northward and westward into the desert before the protruding frontier of white settlement, as the Boers before the English treked farther into the veldt. [See map page 105.]

Where the people attacked or displaced is small or a broken remnant, it often takes refuge among a neighboring or kindred tribe. The small Siouan tribes of the Carolinas, reduced to fragments by repeated Iroquois raids, combined with their Siouan kinsmen the Catawbas, who consequently in 1743 included twenty dialects among their little band.169 The Iroquoian Tuscaroras of North Carolina, defeated and weakened by the whites in 1711, fled north to the Iroquois of New York, where they formed the Sixth Nation of the Confederation. The Yamese Indians, who shifted back and forth between the borders of Florida and South Carolina, defeated first by the whites and then by the Creeks, found a refuge for the remnant of their tribe among the Seminoles, in whom they merged and disappeared as a distinct tribe170 —the fate of most of these fragmentary peoples. [See map page 54.]

When the fugitive body is large, it is forced to split up in order to escape. Hence every fugitive movement tends to assume the character of a dispersal, all the more as organization and leadership vanish in the catastrophe. The fissile character of primitive societies especially contributes to this end, so that almost every story of Indian and native African warfare tells of shattered remnants fleeing in several directions. Among civilized peoples, the dispersal is that of individuals and has far-reaching historical effects. After the destruction of Jerusalem, the Jews were scattered over the earth, the debris of a nation. The religious wars of France during the sixteenth and seventeenth centuries caused Huguenots to flee to Switzerland, Germany, Holland, England, and South Carolina; they even tried to establish a colony on the coast of Brazil. Everywhere they contributed a valuable element to the economic and social life of the community which they joined. The great schism in the Russian Church became an agent of emigration and colonization. It helped to spread the Russian nationality over remote frontier regions of the empire which previously had been almost exclusively Asiatic; and distributed groups of dissenters in the neighboring provinces of Turkey, Roumania, Austria, Poland and Prussia.171

Districts of refuge located centrally to several natural regions of migration receive immigrants from many sides, and are therefore often characterized by a bizarre grouping of populations. The cluster of marshy islands at the head of the Adriatic received fugitives from a long semi-circle of north Italian cities during the barbarian invasions. Each refugee colony occupied a separate island, and finally all coalesced to form the city of Venice. Central mountain districts like the Alps and Caucasus contain "the sweepings of the plains." The Caucasus particularly, on the border between Europe and Asia, contains every physical type and representative of every linguistic family of Eurasia, except pure Aryan. Nowhere else in the world probably is there such a heterogeneous lot of peoples, languages and religions. Ripley calls the Caucasus "a grave of peoples, of languages, of customs and physical types."172 Its base, north and south, and the longitudinal groove through its center from east to west have been swept by various racial currents, which have cast up their flotsam into its valleys. The pueblos of our arid Southwest, essentially an area of asylum, are inhabited by Indians of four distinct stocks, and only one of them, the Moquis, show clearly kinship to another tribe outside this territory,173 so that they are survivals. The twenty-eight different Indian stocks huddled together in small and diverse linguistic groups between the Pacific Ocean and the eastern slope of the Sierra Nevada and Cascade Range174 leave the impression that these protected valleys, similar to the Caucasus in their ethnic diversity, were an asylum for remnants of depleted stocks who had fled to the western highlands before the great Indian migrations of the interior.175 Making their way painfully and at great cost of life through a region of mountain and desert, they came out in diminished bands to survive in the protection of the great barrier. Of the twenty-one Indian linguistic stocks which have become extinct since the arrival of the white man, fifteen belong to this transmontane strip of the Pacific slope176 —evidence of the fragmentary character of these stocks and their consequently small power of resistance, [See map page 54.]

Advance to a completely sedentary life, as we see it among modern civilized nations, prohibits the migration of whole peoples, or even of large groups when maintaining their political organization. On the other hand, however, sedentary life and advanced civilization bring rapid increase of population, improved methods of communication, and an enlarged geographical horizon. These conditions encourage and facilitate emigration and colonization, forms of historical movement which have characterized the great commercial peoples of antiquity and the overcrowded nations of modern times. These forms do not involve a whole people, but only individuals and small groups, though in time the total result may represent a considerable proportion of the original population. The United States in 1890 contained 980,938 immigrants from Canada and Newfoundland,177 or just one-fifth the total population of the Dominion in that same year. Germany since 1820 has contributed at least five million citizens to non-European lands. Ireland since 1841 has seen nearly four millions of its inhabitants drawn off to other countries,178 an amount only little less than its present population. It is estimated that since 1851 emigration has carried off from County Clare and Kerry seventy-two per cent. of the average population; and yet those counties are still crowded.179 Among those who abandon their homes in search of easier conditions of living, certain ages and certain social and industrial classes predominate. A typical emigrant group to America represents largely the lower walks of life, includes an abnormal proportion of men and adults, and about three-fourths of it are unskilled laborers and agriculturists.180

Colonization, the most potent instrument of organized expansion, has in recent centuries changed the relative significance of the great colonial nations of Europe. It raised England from a small insular country to the center of a world power. It gave sudden though temporary preëminence to Spain and Portugal, a new lease of life to little Holland, and ominous importance to Russia. Germany, who entered the colonial field only in 1880, found little desirable land left; and yet it was especially Germany who needed an outlet for her redundant population. With all these states, as with ancient Phoenicia, Greece and Yemen, the initial purpose was commerce or in some form the exploitation of the new territory. Colonies were originally trading stations established as safe termini for trade routes.181 Colonial government, as administered by the mother country, originally had an eye single for the profits of trade: witness the experience of the Thirteen Colonies with Great Britain. Colonial wars have largely meant the rivalry of competing nations seeking the same markets, as the history of the Portuguese and Dutch in the East Indies, and the English and French in America prove. The first Punic War had a like commercial origin—rivalry for the trade of Magna Græcia between Rome and Carthage, the dominant colonial powers of the western Mediterranean. Such wars result in expansion for the victor.

Commerce, which so largely underlies colonization, is itself a form of historical movement. It both causes and stimulates great movements of peoples, yet it differs from these fundamentally in its relation to the land. Commerce traverses the land to reach its destination, but takes account of natural features only as these affect transportation and travel. It has to do with systems of routes and goals, which it aims to reach as quickly as possible. It reduces its cortege to essentials; eliminates women and children. Therefore it surmounts natural barriers which block the advance of other forms of the historical movement. Merchant caravans are constantly crossing the desert, but not so peoples. Traders with loaded yaks or ponies push across the Karakorum Mountains by passes where a migrating horde would starve and freeze. The northern limit of the Mediterranean race in Spain lies sharply defined along the crest of the Pyrenees, whose long unbroken wall forms one of the most pronounced boundaries in Europe;182 yet traders and smugglers have pushed their way through from time immemorial. Long after Etruscan merchants had crossed northward over the Alps, Roman expansion and colonization made a detour around the mountains westward into Gaul, with the result that the Germans received Roman civilization not straight from the south, but secondhand through their Gallic neighbors west of the Rhine.

Commerce, though differing from other historical movements, may give to these direction and destination. The trader is frequently the herald of soldier and settler. He becomes their guide, takes them along the trail which he has blazed, and gives them his own definiteness of aim. The earliest Roman conquest of the Alpine tribes was made for the purpose of opening the passes for traders and abolishing the heavy transit duties imposed by the mountaineers.183 Fur-traders inaugurated French expansion to the far west of Canada, and the Russian advance into Siberia. The ancient amber route across Russia from the Baltic to the Euxine probably guided the Goths in their migration from their northern seats to the fertile lands in southern Russia, where they first appear in history as the Ostrogoths.184 The caravan trade across the Sahara from the Niger to the Mediterranean coast has itself embodied an historical movement, by bringing out enough negro slaves appreciably to modify the ethnic composition of the population in many parts of North Africa.185 It was this trade which also suggested to Prince Henry of Portugal in 1415, when campaigning in Morocco, the plan of reaching the Guinea Coast by sea and diverting its gold dust and slaves to the port of Lisbon, a movement which resulted in the Portuguese circumnavigation of Africa.186

Every staple place and trading station is a center of geographical information; it therefore gives an impulse to expansion by widening the geographical horizon. The Lewis and Clark Expedition found the Mandan villages at the northern bend of the Missouri River the center of a trade which extended west to the Pacific, through the agency of the Crow and Paunch Indians of the upper Yellowstone, and far north to the Assiniboine and Saskatchewan Rivers. Here in conversation with British and French fur-traders of the Northwest Company's posts, they secured information about the western country they were to explore.187 Similarly the trade of the early Jesuit missions at La Pointe near the west end of Lake Superior annually drew the Indians from a wide circle sweeping from Green Bay and the Fox River in the south, across the Mississippi around to the Lake of the Woods and far north of Lake Superior.188 Here Marquette first heard of the great river destined to carry French dominion to the Gulf of Mexico.

The famous pilgrimages of the world, in which the commercial element has been more or less conspicuous,189 have contributed greatly to the circulation of peoples and ideas, especially as they involve multitudes and draw from a large circle of lands. Their economic, intellectual and political effects rank them as one phase of the historical movement. Herodotus tells of seven hundred thousand Egyptians flocking to the city of Bubastis from all parts of Egypt for the festival of Diana.190 The worship of Ashtoreth in Bambyce in Syria drew votaries from all the Semitic peoples except the Jews. As early as 386 A.D. Christian pilgrims flocked to Jerusalem from Armenia, Persia, India, Ethiopia, and even from Gaul and Britain. Jerusalem gave rise to those armed pilgrimages, the Crusades, with all their far-reaching results. The pilgrimages to Rome, which in the Jubilee of 1300 brought two hundred thousand worshipers to the sacred city, did much to consolidate papal supremacy over Latin Christendom.191 As the roads to Rome took the pious wayfarers through Milan, Venice, Genoa, Florence, Bologna, and other great cities of Italy, they were so many channels for the distribution of Italian art and culture over the more untutored lands of western Europe.

Though Mecca is visited annually by only seventy or eighty thousand pilgrims, it puts into motion a far greater number over the whole Mohammedan world, from westernmost Africa to Chinese Turkestan.192 Yearly a great pilgrimage, numbering in 1905 eighty thousand souls, moves across Africa eastward through the Sudan on its way to the Red Sea and Mecca. Many traders join the caravans of the devout both for protection and profit, and the devout themselves travel with herds of cattle to trade in on the way. The merchants are prone to drop out and settle in any attractive country, and few get beyond the populous markets of Wadai. The British and French governments in the Sudan aid and protect these pilgrimages; they recognize them as a political force, because they spread the story of the security and order of European rule.193 The markets of western Tibet, recently opened to Indian merchants by the British expedition to Lhassa, promote intercourse between the two countries especially because of the sacred lakes and mountains in their vicinity, which are goals of pilgrimage alike to Hindu and Tibetan Buddhist. They offer an opportunity to acquire merit and profit at the same time, an irresistible combination to the needy, pious Hindu. Therefore across the rugged passes of the Himalayas he drives his yaks laden with English merchandise, an unconscious instrument for the spread of English influence, English civilization and the extension of the English market, as the Colonial Office well understands.194

Primitive Indian Stocks Of South America (From Helmolt's History of the World. By permission of Dodd, Mead & Co.)

In South America, Caribs and Arawaks showed a strictly tropical distribution from Hayti to the southern watershed of the Amazon. The Tupis, moving down the Parana-La Plata system, made a short excursion beyond the Tropic of Capricorn, though not beyond the hot belt, then turned equator-ward again along the coast.195 In North America we find some exceptions to the rule. For instance, though the main area of the Athapascan stock is found in the frigid belt of Canada and Alaska, north of the annual isotherm of 0°C. (32°F.) small residual fragments of these people are scattered also along the Pacific coast of Oregon and California, marking the old line of march of a large group which drifted southward into Arizona, New Mexico, Texas and the northern part of Mexico. The Shoshone stock, which originally occupied the Great Basin and western intermontane plateau up to the borders of Canada, sent out offshoots which developed into the ancient civilized tribes of tropical Mexico and Central America. Both these emigrations to more southern zones were part of the great southward trend characterizing all movements on the Pacific side of the continent, probably from an original ethnic port of entry near Bering Strait; and part also of the general southward drift in search of more genial climate, which landed the van of northern Siouan, Algonquin and Iroquoian stocks in the present area of South Carolina, Georgia, Alabama, Mississippi and Louisiana, while the base of their territory stretched out to its greatest width in southern Canada and contiguous parts of the United States. [See map page 54.]196

Ethnographical Map Of India From The Indian Census Of 1901.

Ethnographical Map Of Asia. Vertical Shading in the North is Slav.

If we turn to the eastern hemisphere, we find the Malays and Malayo-Polynesians, differentiated offshoots of the Mongolian stock, restricted to the Tropics, except where Polynesians have spread to outlying New Zealand. The Chinese draw their political boundary nearly along the Tropic of Cancer, but they have freely lapped over this frontier into Indo-China as far as Singapore.197 Combined with this expansion was the early infiltration of the Chinese into the Philippines, Borneo, and the western Sunda Isles, all distinctly tropical. The fact that the Chinese show a physical capacity for acclimatization found in no other race explains in part their presence into the Tropics. In contrast, the Aryan folk of India, whether in their pure type as found in the Punjab and Rajputana Desert, or mingled with the earlier Dravidian races belong to the hot belt but scarcely reach the Tropic of Cancer,198 though their language has far overshot this line both in the Deccan and the Ganges Delta. One spore of Aryan stock, in about 450 B.C., moved by sea from the Bay of Cambay to Ceylon; mingling there with the Tamil natives, they became the progenitors of the Singhalese, forming a hybrid tropical offshoot.

Europe, except for its small sub-arctic area, has received immigrants, according to the testimony of history and ethnology, only from the temperate parts of Asia and Africa, with the one exception of the Saracens of Arabia, whose original home lay wholly within the hot climate belt of 20°C. (68°F.). Saracen expansion, in covering Persia, Syria, and Egypt, still kept to this hot belt; only in the Barbary Coast of Africa and in Spain did it protrude into the temperate belt. Though this last territory was extra-tropical, it was essentially semi-arid and sub-tropical in temperature, like the dry trade-wind belt whence the Saracens had sprung.

Ethnographical Map Of Africa And Arabia.

The Semitic folk of Arabia and the desert Hamites of northern Africa, bred by their hot, dry environment to a nomadic life, have been drawn southward over the Sahara across the Tropic into the grasslands of the Sudan, permeating a wide zone of negro folk with the political control, religion, civilization and blood of the Mediterranean north. Here similar though better conditions of life, a climate hotter though less arid, attracted Hamitic invasion, while the relatively dense native population in a lower stage of economic development presented to the commercial Semites the attraction of lucrative trade. South of the equator the native Bantu Kaffirs, essentially a tropical people, spread beyond their zonal border to the south coast of Africa at 33° S.L., and displaced the yellow Hottentots199 before the arrival of the Dutch in 1602; while in the early nineteenth century we hear of the Makololo, a division of this same Kaffir stock, leaving their native seats near the southern sources of the Vaal River at 28° S.L. and moving some nine hundred miles northward to the Barotse territory on the upper Zambesi at 15° S.L.200 This again was a movement of a pastoral people across a tropic to other grasslands, to climatic conditions scarcely different from those which they had left.

The modern colonial movements which have been genuine race expansions have shown a tendency not only to adhere to their zone, but to follow parallels of latitude or isotherms. The stratification of European peoples in the Americas, excepting Spanish and Portuguese, coincides with heat zones. Internal colonization in the United States reveals the same principle.201 Russian settlements in Asia stretch across Siberia chiefly between the fiftieth and fifty-fifth parallels; these same lines include the ancient Slav territory in Germany between the Vistula and Weser. The great efflux of home-seekers, as opposed to the smaller contingent of mere conquerors and exploiters, which has poured forth from Europe since the fifteenth century, has found its destinations largely in the temperate parts of the Americas, Australia, New Zealand, and South Africa. Even the Spanish overlords in Mexico and Peru domiciled themselves chiefly in the highlands, where altitude in part counteracts tropical latitude. European immigration into South America to-day greatly predominates in the temperate portions,—in Argentine, Uruguay, Paraguay, southern Brazil and southern Chile. While Argentine's population includes over one million white foreigners, who comprise twenty per cent. of the total,202 Venezuela has no genuine white immigration. Its population, which comprises only one per cent. of pure whites, consists chiefly of negroes, mulattoes, and Sambos, hybrids of negro and Indian race. In British Guiana, negroes and East Indian coolies, both importations from other tropical lands, comprise eighty-one per cent. of the population.203

The movement of Europeans into the tropical regions of Asia, Australasia, Africa and America, like the American advance into the Philippines, represents commercial and political, not genuine ethnic expansion. Except where it resorts to hybridization, it seeks not new homesteads, but the profits of tropical trade and the markets for European manufactures found in retarded populations. These it secures either by a small but permanently domiciled ruling class, as formerly in Spanish and Portuguese America, or by a body of European officials, clerks, agents and soldiers, sent out for a term of years. Such are the seventy-six thousand Britishers who manage the affairs of commerce and state in British India, and the smaller number of Dutch who perform the same functions in the Dutch East India islands. The basis of this system is exploitation. It represents neither a high economic, ethical, nor social ideal, and therefore lacks the stamp of geographic finality.

A migrating or expanding people, when free to choose, is prone to seek a new home with like geographic conditions to the old. Hence the stamp once given by an environment tends to perpetuate itself. All people, especially those in the lower stages of culture, are conservative in their fundamental activities. Agriculture is intolerable to pastoral nomads, hunting has little attraction for a genuine fisher folk. Therefore such peoples in expansion seek an environment in which the national aptitudes, slowly evolved in their native seats, find a ready field. Thus arise natural provinces of distribution, whose location, climate, physical features, and size reflect the social and economic adaptation of the inhabitants to a certain type of environment. A shepherd folk, when breaking off from its parent stock like Abraham's family from their Mesopotamian kinsmen, seeks a land rich in open pastures and large enough to support its wasteful nomadic economy. A seafaring people absorb an ever longer strip of seaboard, like the Eskimo of Arctic America, or throw out their settlements from inlet to inlet or island to island, as did Malays and Polynesians in the Pacific, ancient Greeks and Phoenicians in the subtropical Mediterranean, and the Norse in the northern seas. The Dutch, bred to the national profession of diking and draining, appear in their element in the water-logged coast of Sumatra and Guiana,204 where they cultivate lands reclaimed from the sea; or as colonists in the Vistula lowlands, whither Prussia imported them to do their ancestral task, just as the English employed their Dutch prisoners after the wars with Holland in the seventeenth century to dike and drain the fens of Cambridgeshire and Lincolnshire. Moreover, the commercial talent of the Dutch, trained by their advantageous situation on the North Sea about the Rhine mouths, guided their early traders to similar locations elsewhere, like the Hudson and Delaware Rivers, or planted them on islands either furnishing or commanding extensive trade, such as Ceylon, Mauritius, the East Indies, or the Dutch holdings in the Antilles.

Much farther down in the cultural scale we find the fisher tribes of Central Africa extending their villages from point to point along the equatorial streams, and the river Indians of South America gradually spreading from headwaters to estuary, and thence to the related environment of the coast. The Tupis, essentially a water race, have left traces of their occupation only where river or coast enabled them to live by their inherited aptitudes.205 The distribution of the ancient mounds in North America shows their builders to have sought with few exceptions protected sites near alluvial lowlands, commanding rich soil for cultivation and the fish supply from the nearby river. Mountaineer folk often move from one upland district to another, as did the Lombards of Alpine Pannonia in their conquest of Lombardy and Apennine Italy, where all their four duchies were restricted to the highlands of the peninsula.206 The conquests of the ancient Incas and the spread of their race covered one Andean valley after another for a stretch of one thousand five hundred miles, wherever climatic and physical conditions were favorable to their irrigated tillage and highland herds of llamas. They found it easier to climb pass after pass and mount to ever higher altitudes, rather than descend to the suffocating coasts where neither man nor beast could long survive, though they pushed the political boundary finally to the seaboard. [Map page 101.]

The attraction of a milder climate has caused in the northern hemisphere a constantly recurring migration from north to south. In primitive North America, along the whole broad Atlantic slope, the predominant direction of Indian migrations was from north to south, accompanied by a drift from west to east.207 On the Pacific side of the continent also the trend was southward. This is generally conceded regardless of theory as to whether the Indians first found entrance to the continent at its northeast or northwest corner. It was a movement toward milder climates.208 Study of the Völkerwanderungen in Europe reveals two currents or drifts in varied combination, one from north to south and the other from east to west, but both of them aimed at regions of better climate; for the milder temperature and more abundant rainfall of western Europe made a country as alluring to the Goths, Huns, Alans, Slavs, Bulgars and Tartars of Asiatic deserts and Russian steppes, as were the sunny Mediterranean peninsulas to the dwellers of the bleak Baltic coasts. This is one geographic fact back of the conspicuous westward movement formulated into an historical principle: "Westward the star of empire takes its course." The establishment of European colonies on the western side of the Atlantic, their extension thence to the Pacific and ever westward, till European culture was transplanted to the Philippines by Spain and more recently by the United States, constitute the most remarkable sustained movement made by any one race.

But westward movements are not the only ones. On the Pacific slope of Asia the star has moved eastward. From highland Mongolia issued the throng which originally populated the lowlands of China; and ever since, one nomad conqueror after the other has descended thence to rule the fruitful plains of Chili and the teeming populations of the Yangtze Valley.209 Russia, blocked in its hoped for expansion to the west by the strong powers of central Europe, stretched its dominion eastward to the Pacific and for a short time over to Alaska. The chief expansion of the German people and the German Empire in historical times has also been from west to east; but this eastward advance is probably only retracing the steps taken by many primitive Teutonic tribes as they drifted Rhineward from an earlier habitat along the Vistula.

Voluntary historical movements, seeking congenial or choice regions of the earth, have left its less favored spots undisturbed. Paucity of resources and isolation have generally insured to a region a peaceful history; natural wealth has always brought the conqueror. In ancient Greece the fruitful plains of Thessaly, Boeotia, Elis and Laconia had a fatal attraction for every migrating horde; Attica's rugged surface, poor soil, and side-tracked location off the main line of travel between Hellas and the Peloponnesus saved it from many a rough visitant,210 and hence left the Athenians, according to Thucydides, an indigenous race. The fertility of the Rhine Valley has always attracted invasion, the barren Black Forest range has repelled and obstructed it.

The security of such unproductive highlands lies more in their failure to attract than in their power to resist conquest. When to abundant natural resources, a single spot adds a reputation for wealth, magnificence, an exceptional position for the control of territory or commerce, it becomes a geographical magnet. Such was Delphi for the Gauls of the Balkan Peninsula in the third century, Rome for the Germanic and Hunnish tribes of the Völkerwanderung, Constantinople for the Normans, Turks and Russians, Venice for land-locked Austria, the Mississippi highway and the outlet at New Orleans for our Trans-Allegheny pioneers.

Sometimes the goal is fabulous or mythical, but potent to lure, like the land of El Dorado, abounding in gold and jewels, which for two centuries spurred on Spanish exploration in America. Other than purely material motives may initiate or maintain such a movement, an ideal or a dream of good, like the fountain of eternal youth which brought Ponce de Leon to Florida, the search for the Islands of the Blessed, or the spirit of religious propaganda which stimulated the spread of the Spanish in Mexico and the French in Canada, or the hope of religious toleration which has drawn Quaker, Puritan, Huguenot, and Jew to America. It was an idea of purely spiritual import which directed the century-long movement of the Crusades toward Jerusalem, half Latinized the Levant, and widened the intellectual horizon of Europe. A national or racial sentiment which enhaloes a certain spot may be pregnant with historical results, because at any moment it may start some band of enthusiasts on a path of migration or conquest. The Zionist agitation for the return of oppressed Jews to Palestine, and the establishment of the Liberian Republic for the negroes in Africa rest upon such a sentiment. The reverence of the Christian world for Rome as a goal of pilgrimages materially enhanced the influence of Italy as a school of culture during the Middle Ages. The spiritual and ethnic association of the Mohammedan world with Mecca is always fraught with possible political results. The dominant tribes of the Sudan, followers of Islam, who proudly trace back a fictitious line of ancestry to the Arabs of Yemen, are readily incited to support a new prophet sprung from the race of Mecca.211 The pilgrimages which the Buddhists of the Asiatic highlands make to the sacred city of Lhassa ensure China's control over the restless nomads through the instrumentality of the Grand Lama of Tibet.

A people or race which, in its process of numerical growth, spreads over a large territory subjects itself to a widening range of geographic conditions, and therefore of differentiation. The broad expansion of the Teutonic race in Europe, America, Australia and South Africa has brought it into every variety of habitat. If the territory has a monotonous relief like Russia, nevertheless, its mere extent involves diversity of climate and location. The diversity of climate incident to large area involves in turn different animal and plant life, different crops, different economic activities. Even in lowlands the relief, geologic structure, and soil are prone to vary over wide districts. The monotonous surface of Holland shows such contrasts. So do the North German lowlands; here the sandy barren flats of the "geest" alternate with stretches of fertile silt deposited by the rivers or the sea,212 and support different types of communities, which have been admirably described by Gustav Frenssen in his great novel of Jön Uhl. The flat surface of southern Illinois shows in small compass the teeming fertility of the famous "American bottom," the poor clay soil of "Egypt" with its backward population, and the rich prairie land just to the north with its prosperous and progressive farmer class.

When the relief includes mountains, the character not only of the land but of the climate changes, and therewith the type of community. Hence neighboring districts may produce strongly contrasted types of society. Madison County of Kentucky, lying on the eastern margin of the Bluegrass region, contains the rich landed estates, negro laboring class and aristocratic society characteristic of the "planter" communities of the old South; and only twenty miles southeast of Richmond, the center of this wealth and refinement, it includes also the rough barren hill country of the Cumberland Plateau, where are found one-room cabins, moonshine stills, feuds, and a backward population sprung from the same pure English stock as the Bluegrass people.