The USA remained pretty neutral until the attacks on Pearl harbor.
Vietnam.
Warmongers, dawg
1964-1975
No, it was a European war we chose to become involved in.
The US got involved in the war on: April 6, 1917.
The Korean War ,
The Korean War/conflict .
The sinking of the Lusitania caused the US to get involved.
The Cold War, then Vietnam.
Un-restricted submarine warfare
Pearl Harbor attack
As Allies of Uk and France the US went to war in Euope when Germany declared war on US on Dec 10, 1941