Because of the threat of the Soviet Union.
Germany fought the us in world war 1
No Germany declares war on US
No, they were sent back to Germany and Japan.
Initially, the US was to remain neutral in World War I but in 1917 Germany attempted to form and alliance with Mexico. Also, Germany began sinking US ships. These events led the US to declare war on April 6, 1917.
Germany
germany
Germany
Germany declared war on the US after Pearl Harbour.
The US declared war on Germany, hour after Germany declared war on the US on December 11, 1941.
They were trying to get out of the Great Depression and weren't interested of what was going on in Europe as they didn't want to get into another war.
The US got into WW2 after pledging to stay out of the war after the Japanese attacked Pearl Harbor.
The US declared war on Germany on Dec 11th 1941, (two days after Germany declared war on the US). Everything since that date to the present is after.