It had evolved into a World Power.
Part of the cold war.
Warmongers, dawg
The US was attacked.
1898 as war booty after the US won spanish american war
1954
Vietnam.
The US got involved in the war on: April 6, 1917.
As Allies of Uk and France the US went to war in Euope when Germany declared war on US on Dec 10, 1941
No, it was a European war we chose to become involved in.
The US got into WW2 after pledging to stay out of the war after the Japanese attacked Pearl Harbor.
As soon as the US entered the war in December 1941
1964-1975