Russia was the US's main enemy after WW2
The United States of America fought the Confederate States of America in the Civil war.
Joseph Stalin was the leader of the Soviet Union after World War II. While allies of Britain and the United States during the war, this was mainly because all considered Hitler to be their enemy. Directly, after the war, Britain and the United States ended their relationship with Stalin.
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.
The basic answer is yes. In truth, it was more of a "well, they're the enemy of my enemy, so I'll work with them" situation.
The United States was fighting against an enemy who discriminated by race while allowing discrimination at home.
Fresh troops who outnumbered the enemy
World War I Victory Medal - United States - was created in 1919.
United Kingdom
This was a direct attack on the US from Japan. By attacking the United States, the Axis were sending a message that they considered the US an enemy. This pulled the United States to fight back.
United States Navy operations during World War I happened in 1917.
United States Submarine Operations in World War II was created in 1949.