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The United States of America. The Battle of Iwo Jima, 1945. The World Wars ended the United States' policy of isolationism and left it as a world superpower. The history of the United States from 1917 to 1945 was marked by World War I, the interwar period, the Great Depression, and World War II .
The history of the United States from 1918 through 1945 covers the post-World War I era, the Great Depression, and World War II. After World War I, the U.S. rejected the Treaty of Versailles and did not join the League of Nations.