No
Germany and Austria-Hungary
Germany declared war on the US on 11 December 1941
Germany and japan
The US fought Germany and Austria-Hungary in World War I.
Germany surrendered unconditionally to General Eisenhower. Michael Montagne
Germany
Mexico.
Germany
Germany and Japan mostly
Japan
The US did not have any standing agreements to aid Poland in the event of an invasion, France and Great Britain did. There was no need for the US to pick a fight with Germany just for the sake of fighting.