The volume traces political and military developments in Athens, emphasizing judicial reforms that broadened citizen participation and the intensive naval service that professionalized the maritime populace and secured Athenian sea-dominance. It explains how the Delian League gradually became an Athenian empire as tribute collection and the common treasury were transferred to Athens, and it examines the city’s fiscal organization and revenue sources. The narrative outlines Pericles’ policy of withholding detailed account from allies while maintaining naval protection, and considers the political tensions that arose from treating allied states as subjects without shared institutions.