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Congress passed a series of Neutrality Acts. The Neutrality Acts made it illegal to sell or lend war material and money.
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President Roosevelt asked congress if they would allow them to sell American arms to the Allies.
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The Lend-Lease Act was passed. The Lend-Lease Act allowed the president to lend or lease war materials and other supplies to any country the could help the United States later on.
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The U.S. navy started escorting British Ships that carried U.S. arms. Hilter found out and order his submarines to sink any cargo ship they saw.
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A Germam U-boat fired on a U.S. destroyer in the Atlantic Ocean. Roosevelt then order his commanders to shoot German submarines on sight. But the attack actually came from Japan