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Japan looking to expand and increase it's supply of natural resources invades Manchuria and establishes a puppet government (in violation of the League of Nations)

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Stimson Doctrine
Explanation here

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Neutrality Acts are passed by Congress in order to strictly ensure that the United States must remain neutral if conflict or war broke out in Europe.

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Spanish Civil War is fought in Spain. Battle between fascist forces, led by General Francisco Franco and Loyalists, who supported republicanism. Ultimately, Franco prevails and a military dictatorship is in place.

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Hitler broke the Munich agreement by sending troops to occupy Czechoslovakia.

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Germany and the Soviet Union had a secret meeting were they signed a nonaggression pact.

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German began there full invasion of Poland. As promised by the Britain and France, they went to defend Poland from the German attack.

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After the fall of France to the Germans, Roosevelt tried promoting to Congress less restrictive neutrality laws in order to give out more support to Britain. These included the Cash and Carry, Selective Service Act(1940), and Destroyers-For-Bases Deal.

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Due to the war, there was a lot of uncertainty, especially over a presidential election. Roosevelt already served two-terms so the people were speculating if he would break this rule because of the uncertain times. Roosevelt ended up taking the democratic nomination and won against Wendell Willkie, serving as president for a third term.

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Once Roosevelt was reelected, he decided to put an end to U.S. neutrality. He gave a speech about helping Britain and protecting their four freedoms. This then led Roosevelt to create the Lend-Lease Act, which put an end so many policies from the Neutrality Act and allowed the U.S. to provide more assistance to Britain.

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It affirmed that the general principles for a sound peace after the war would include self-determination for all people, no territorial expansion, and free trade.

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The U.S got involved in a naval war with Germany after they attacked the American Destroyer Greer. The U.S decided that they would attack all German ships on sight.

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Through 1940 and 1941, U.S relations with Japan were becoming increasingly strained as a result of Japans invasion of China and ambitions to extend its conquest to Southeast Asia.

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Roosevelt froze all Japanese credits in the U.S and also cut off their access to vital materials.

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Japan needed oil from the U.S. The Japanese government tried to make one final attempt to negotiate and agreement, but neither sides changed their positions. The U.S wanted to strengthen their forces before they had to endure armed confrontation, but Japan believed that quick action was necessary.

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Japan Attacks Pearl Harbor