You can spin it however you like. I leave it to your imagination what France or Belgium would be like right now if those Allies you mention had mostly consisted of Great Britain and the Soviet Union.

Without the U.S., Europe would either be under the Third Reich, or the Soviet Empire, or even worse, a cratered No-Man's-Land from a years-long war between the two for the prize.

There would be no South Korea. Japan would rule much of Asia and the Pacific, or as with Europe, perhaps still engaged in bitter warfare with China over the ruins of Southeast Asia.

Much of Africa would be contested by these powers. I have no idea what would be left of Australia.

And of course, this assumes that somehow the United States could remain apart from all this.

Democracies don't make war on each other. Totalitarian systems do. You can imagine what the Eastern Hemisphere would be like torn between the Nazis, Soviets, Communist Chinese, and Japanese Empire.