The allies of the US were Great Britain, free France, Russia and non-communist China. None of the members of the British Commonwealth were enemies .
None of the nations occupied by the Germans and Italians were enemies.
Switzerland and the Scandinavian countries were not enemies. None of the South American countries were enemies although Argentina was sympathetic to the Germans. None of the French and Dutch possessions were enemies.
Japan
Russia.
Japan & Germany .
They were mainly Germany , Italy and Japan.
During World War 2, California was part of the United States, so any enemy of the U.S. would, by extension, have been an enemy of California. For example, Italy, Japan, or Germany.
Germany.
Japan
Germany was Britain's main enemy.
Germany Italy & Japan ( The Axis)
They were not placed anywhere. Japan was not an enemy in World War I.
The Cold War involved the entire world; every country was an actual or potential enemy or friend of either the US or the USSR.
Germany invaded France during World War II.