I know we didn't do it all, but we did have a major part in it, I recognize the other nation's achievements, the battle of britian, stalingrad, leningrad, kursk, el almein, the commando raids, dunkirk. The casualties is not by what the people say "save your asses" its the material support, most of the weapons used in WWII where american designs (not saying we did it all either, spitfire, churchill tank, lags and migs, t-43) the RAF and Soviet air force used some american planes, under the lend-lease program (the boston, P-40, P-39, P-51A, A-20 etc.) and the soviets and british both used US-built/designed tanks with at least 1 division, with tanks like the sherman. Also, please don't turn this into a flame war.

EDIT: Also, most invasion were not just us, the vietnam war was Vietnam, China, and North korea vs USA, australia, South korea, and Thailand) Iraq wars (Iraq vs NATO, Eygpt, Syria, Suadi Arabia, Oman) or Afghanistan (Taliban vs NATO and Afghanistan)