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US started a neutrality act which would make people have to buy in cash and ship their own goods in their own boats. Kept the US out of the war.
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Japan attacked territories of the US which caused us to cut trade from them and made them angry with us.
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"The enemy of our enemy is our friend" The US thought if Stalin was Hitlers enemy they were our friend so we sent supplies to them.
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US makes the lend lease act which lets us send supplies to anyone who can help defend the democracy in the US
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Germany sank 3 ships killing more than 100 men which caused us to start a shooting war with them.
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Japan said they were getting ready for an attack on the US and we got ready for it.
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Japan attacked the US in an ambush destroying most of our airplanes and ships