The contention was: Lol there’s never been a genocide on US soil.
LOL?!?! OK, that’s just wrong in so many ways. Yes, without argument there have been acts of genocide on US soil. It is undeniably in the public record. This mythology that we can say “thank you, Lord, that this nation is not like other nations” is a very harmful bit of self-delusion, particularly if it is extended to the “soil” of our territories as a whole since 1492 (or even before that, as there were undoubtedly stronger nations swallowing the weaker before that) and not just the official acts of the US government herself. Yes, we’ve been like other nations. We have some things to be proud of, but freedom from any acts or intention of genocide is NOT among them!!
No, the tragedy of unintentionally-imported smallpox doesn’t get that comment off the hook.
For the record (and back to the topic of the thread): Freedom from bouts of irrational fear of immigration is not among them, either. That one also makes its regular rounds in the minds of the populace. It can be demonstrated that it is doing so right now: that is, total fabrications about immigration are made up out of whole cloth, and people rush to swallow them, hook, line and sinker.