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The Nye Committee investigates the role of arms manufacturers in pushing the United States into World War I, fostering a sentiment of isolationism in the country.
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Congress passes a series of Neutrality Acts to prevent the U.S. from being drawn into external conflicts, reflecting the nation's commitment to maintaining a neutral stance.
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Germany invades Poland, marking the start of World War II and prompting increased international tensions.
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The U.S. provides Britain with destroyers in exchange for military bases, signaling a shift towards interventionist policies to support Allied nations.
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President Roosevelt declares a Hemispheric Defense Zone in the Atlantic, allowing U.S. naval vessels to escort Allied convoys and protect American interests.
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President Roosevelt and Prime Minister Churchill issue the Atlantic Charter, outlining post-war goals for peace, democracy, and self-determination.
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The U.S. introduces the Lend-Lease Act, allowing the provision of military aid to Allied nations, a significant step away from strict neutrality.
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Japan launches a surprise attack on Pearl Harbor, leading to the United States' entry into World War II and solidifying its commitment to the Allied cause.