Abstract

This chapter examines how the United States evolved as a world power during the period 1776–1945. It first considers how Americans set out after the War of Independence to establish a continental empire. Thomas Jefferson called this an ‘empire for liberty’, but by the early nineteenth century the United States had become part of an empire containing human slavery. Abraham Lincoln determined to stop the territorial expansion of this slavery and thus helped bring about the Civil War. The reunification of the country after the Civil War, and the industrial revolution which followed, turned the United States into the world’s leading economic power by the early twentieth century. The chapter also discusses Woodrow Wilson’s empire of ideology and concludes with an analysis of U.S. economic depression and the onset of the Cold War.