It's quite ignorant to say that the US won the war, considering it was none of their buisness to be involved in anyway.
They did, however, play a signifigant role in fighting through Fortress Europa and defeating the Nazi forces in Germany. It was a group effort by many forces, though. Some of these forces included:
Canada
cause they fought hard
yes
Yes
Patton.
World War ll
President truman
By making newsreels and Propaganda
maybe because it had world wars like world war l and world war ll
Russia.
What were the major problems facing Western Europe after the war
the Cold War.
they were fighting against the germans, japanese, and italy