The US has been drunk on the delusion of how noble and benevolent we consider ourselves since World War II.
We like to conveniently forget that at the time, many Americans looked up to the Nazis and were embracing eugenics. We were legally sterilizing subjective "undesirables," often without their knowledge, and we had no plans to do shit until the Axis, already steeped in conflict, decided to attack us directly from half a world away, committing one of the greatest self-inflicted tactical blunders in history thankfully.
America is all about subjugation, exploitation, and genocide. It just got a propaganda team to soften the way in which it talks about it since the mid 20th century.
At the end of the day, that's the magic of America: bullshitting. Lying. To ourselves and others. From "all men* are created equal" (Only applies to wealthy Caucasian land owners) to "manifest destiny" (genocide the people that already live here because its our destiny) to "separate but equal"(even apex American bullshitters couldn't say this one with a straight face) to "turning the bull loose"(get back to work slaves, this isn't a society) to "don't ask, don't tell" (we refuse to accept you as a human being, but hey come die gruesomely so our greedy fucks can access foreign oil markets). Our bullshit machine runs so deep, we are a ~~nation~~ capital exploitation farm that practically doubles as a religion.