"In 1928, Hitler remarked, approvingly, that white settlers in America had “gunned down the millions of redskins to a few hundred thousand.” When he spoke of Lebensraum, the German drive for “living space” in Eastern Europe, he often had America in mind."
https://www.newyorker.com/magazine/2018/04/30/how-american-racism-influenced-hitler
This lebensraum (Nazi move east) is the ancestor of "Manifest destiny" (the white settlers move West, who via state sanctioned policies murdered and ethnically cleansed the Native people from their land.
theodore roosevelt:
"I don't go so far as to think that the only good Indians are dead Indians, but I believe nine out of ten are, and I shouldn't like to inquire too closely into the case of the tenth"
L Frank Baum (he who wrote wizard of Oz):
"The Pioneer has before declared that our only safety depends upon the total extermination of the Indians. Having wronged them for centuries, we had better, in order to protect our civilization, follow it up by one more wrong and wipe these untamed and untamable creatures from the face of the earth."