World War I, Great Depression, and World War II

1. The United States stayed fair from the scene of World War I, in 1914, until 1917 when it joined the war as a "related force", close to the formal Allies of World War I, turning the tide against the Central Powers. In 1919, President Woodrow Wilson had essential discretionary impact at the Paris Peace Conference and maintained decidedly for the U.S. to join the League of Nations. In any case, the Senate declined to bolster this, and did not endorse the Treaty of Versailles that built up the League of Nations.
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3. In 1920, the ladies' rights change won fragment of a developed cure giving ladies' suffrage.[116] The 1920s and 1930s saw the ascending of radio for mass correspondence and the progression of early television.The succeeding of the Roaring Twenties finished with the Wall Street Crash of 1929 and the onset of the Great Depression. After his decision as president in 1932, Franklin D. Roosevelt reacted with the New Deal, which solidified the foundation of the Social Security system.[118] The Great Migration of countless Americans out of the American South started before World War I and reached out through the 1960s; while the Dust Bowl of the mid-1930s bankrupted different creating get-togethers and prompted another surge of western migration 
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5. At sufficiently first fair-minded amidst World War II while Germany vanquished an impressive measure of landscape Europe, the United States started supplying material to the Allies in March 1941 through the Lend-Lease program. On December 7, 1941, the Empire of Japan pushed a stunningness snare on Pearl Harbor, impelling the United States to join the Allies against the Axis powers.During the war, the United States was proposed as one of the "Four Policemen"of Allies force who met to compose the after war world, close-by Britain, the Soviet Union and China. Though the country lost more than 400,000 soldiers,[125] it climbed respectably undamaged from the war with considerably more basic budgetary and military influence.
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7. The United States expected a key part in the Bretton Woods and Yalta social events with the United Kingdom, the Soviet Union and assorted Allies, which consented to game-plans on new far reaching money related establishments and Europe's after war patch up. As an Allied triumph was won in Europe, a 1945 general meeting held in San Francisco made the United Nations Charter, which persuaded the chance to be alterable after the war.[127] The United States built up the essential atomic weapons and utilized them on Japan; the Japanese surrendered on September 2, finishing World War II.
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