Only congress can declare war, not even the President has this power.
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US Civil War & Vietnam War.
1917
Well, in WWII, America was an ally with France so they didn't declare war on France. Although America didn't start war on Italy (one of their enemies in WWII), because America didn't want to join the war. They thought it was too dangerous.
Attack on Pearl Harbor.
In the United States government, Congress has the power to declare war on other nations.