A concise treatise that distills American constitutional principles and illustrates them through leading decisions, organized by topic: supremacy of the Constitution; legislative powers; taxation; commerce; contracts and property; executive and judicial powers; state comity, territories, and limitations; fundamental rights; and citizenship. It presents legal doctrines alongside authoritative case examples, explains methods of interpreting constitutional authority, and offers a compact reference suitable for students and general readers seeking a structural overview of constitutional law. The volume also reproduces the national Constitution and an annotated list of cited cases for further study.