This best-selling text presents the best synthesis of current scholarship available to emphasize the theme of expansionism and its manifestations. The inclusion of recently declassified documents allows for new perspectives on American intervention in the Bolshevik Revolution, the origins of the Cold War and the Korean War, and the Cuban missile crisis. The Sixth Edition includes strong coverage of gender and culture and explores the racial dimensions of American expansionist ideology. Up-to-date coverage of national security and its implications allows students to examine the government's role in protecting citizens.