The US never went through a character arc. Why and how would they? They're hyper focused on violence and the self, leaving behind morality, self reflection and self restraint, and they're self-centered enough that they never cared for someone else's suffering. This is also why the US is not an actual community but a collection of competing strangers. It's a nation of selfish villains, basically Western European culture on crack (which would make Israel Western culture on fent? lol), the unholy child of the two major historical villains France and the UK...

After all these years, they're the same people, the same amoral, heartless morons. They haven't changed and they never will without external help, because from their Anglo-Saxon/Western European origins they will only find idk forest fairies and Viking pillaging and orgies in their ideological toolbox. So whatever excuse for violent takeover they had centuries ago will work again today, and I don't think it'll change, not for at least 50 years post American balkanization or something, and God knows when that's gonna happen.