The Americans.
Second World War, in which over 16 million Americans were inducted into the Armed Forces.
GermanyItalyJapan
Americans
yes
The American civil war.
Because they wanted to fight for their country
No most were locked in interment camps.
yes
They fought the Nazis, Japanese, and Italians.
You spelt World as Wold, and instead of fought you put fight.
If you mean before 1917, no. we were neutral until 1917