Except can you really say “genociding native americans”

As a country, the US has spent more of its existence genociding native Americans than allowing women to vote, or having a standing army.

and “slavery” are a part of American culture?

The US currently has fully legalized privatized slavery. You, specifically you, can own a slave in the US right now. You can even treat them as if the constitution does not apply to them in any way. Simply buy a prisoner and get a judge to commit that prisoner to you for the length of their sentence. It's so ingrained in our culture, we've never stopped the practice.