This is not ancient history and the US is not unique in its genocidal actions. There is not a country that exists that has not engaged in this behavior.
There are several genocides going on right now.
https://www.genocidewatch.com/countries-at-risk
I know there is a problem. In fact, I gather I know a lot more than you about it. Not disagreeing about that aspect at all.
Having said that we are also experiencing far less genocide than any other time in history. It is weird to say it but things have gotten a lot better although I am sure the Palestinians, for example, would disagree.
The world is objectively more peaceful and billions of people are better off than ever before.
https://oneearthfuture.org/en/one-earth-future/news/world-getting-more-peaceful
https://www.vox.com/2014/11/24/7272929/global-poverty-health-crime-literacy-good-news
Downplaying genocides around the world makes you look pretty callous.