

80% of the Japanese military was being slowly routed in China while America was hopping between islands and building genocide bombs. The American conflict with Japan is better understood as the inevitable clash of two empires expanding into the same place, rather than some kind of rescue of the Koreans, half of whom are still under American occupation.
You seem to be under the impression that I think America deserves 20% credit for dislodging the Japanese Empire. I’m sorry for giving you this mistaken impression, because in truth America deserves 0% credit for doing it. America did not defeat the Japanese Empire and liberate the former imperial holdings, they simply captured it for themselves instead.
Also the effectiveness of lend-lease and other actions taken by America to weaken their imperial rival economically are greatly overstated.