The US praised the Nazis for killing the communists. They supported their "cause" riiiiight up until they started attacking western Europe AKA the countries that actually matter.

The US also hired tons of Nazi "scientists," including granting them immunity for their roles in the Holocaust. They also granted the head of Unit 731 immunity (specifically from the USSR who rightly wanted him executed) in exchange for the human experimentation data. NATO coincidentally also has a ton of Nazis in its leadership.

The US went as far as installing prominent Nazi figures back into West Germany in the same way they let confederates go back to their lives after the civil war. Whereas the Soviets executed Nazi leaders in East Germany because that's what they fucking deserve. The US then claimed that the executed Nazis were victims of communism and included them in their "communism death toll" numbers.

This isn't an error. The US has always been sympathetic to Nazis, before, during, and after the war. They only begrudgingly pitched in against them because they viewed western Europe as slightly more important.

Finally, the US didn't even fucking do that much. Certainly nowhere near enough to justify their claim that they "saved the world" in WWII. The USSR and UK each did far more yet the US seems to think the USSR was fighting for the Nazis and the UK was a scared poodle hiding in their island until the heroic Americans came to save them, when in reality, the tide had already turned against the Nazis by the time the US joined. They also nuked Japan just because they could, it had nothing to do with the war because they already had intelligence that Japan was about to surrender.