The US opted for imperialism.
USSR was the lesser of three evils between Germany and Japan, the only reason America backed USSR. Also Japan and Germany threatened US imperialism and the US had to wait until an event like pearl harbor to appear to be the good guy.
USA opted for atrocities instead of invasion or truce in regards to Japan. The logic was, “make Japan surrender, take away their right to military, then try to offer them a right to a military when they are pro american.”
Problem is, Japan became isolationist after WWII, so US imperialism failed military in Japan, but economically it turned out pretty good.
Russia is a huge wrench in US imperialism, but not as bad as Germany would have been if in control of Europe (or Japan in Asia).
It is kind of sad the axis lost WWII, post war SEA would have been liberated while China would be oppressed… possibly liberated later. Europe would eventually collapse into nation-states again.