re: I'm proud and happy that this land, America, was conquered by European explorers

One leftist transplant from Oregon pontificated to me about "the noble savage" that the Europeans despoiled.

Proceeded to tell him what they used to do to each other that on the pain threshold/scale rivalled, even exceeded, anything that was done during the Inquisition.

Particularly among the plains Indians, but especially among the Incas, Mayans and Aztecs.

It was just one culture with a propensity for cruelty finding another one, with one of them having the wherewithal to win.