Ha, we were hardly the ones solely responsible. Don't forget the Canadians and the British. And the loads of illegal immigrants as well.
Additionally, US only entered because Japan bombed Hawaii and Germany declared war on US. US didn't give half a shit about France unless it was buying US merch.
Wow I strongly disagree there. We were giving so much military equipment to the Brits and Russians to fight the Nazis it boggles the mind*. We were definitely getting into the war and definitely getting into the Euro theater, Roosevelt just needed an event.
*We gave Russia almost 400,000 large trucks! Plus 14,000 airplanes, 44,000 jeeps, 8,000 tractors, 13,000 tanks, etc. And I don't have numbers like that for the amount of material given to the British, but I do know it was three times as much as we gave to Russia.