The u.s. DID get involved.
1917
yes they were
No
yes
World War 2
There were 116,000 US casualties. 4,744,000 were involved.
They didnt want to start a war
The US contributed some 16 million personnel to the Second World War. I'd say that would indicate they did get involved.
The United States became involved in the World War II about March 1941.
the US by FAR.
December 8, 1941 was the date of the US declaration of war
The US was involved for 6 years from 1941-1945