>A lot of the early European settlers in the US were fleeing religious persecution.

What's your point?

Some of them turned around and treated people who didn't fit in with them even worse than they themselves had been treated when in Europe. I can think of a couple groups who, in retrospect, the natives should have killed on day 1.

My comment wasn’t clear - tehjoker stated that the US had never let in a lot of persecuted people. The early European colonisers included a lot of small groups fleeing persecution. As you mention, formerly persecuted groups don’t seem to behave better when they get power.