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

The ridiculous mindset that this was a native utopia before the Europeans of the 15th century is ignorant.

First off, Europeans and Africans as well as Asians had been here for centuries prior.
Second, a group of "historians" and leftists has sold the majority on the idea that natives rarely killed each other in battle. Complete farce as archeologist have proven. native tribes were no more or less violent than any other culture. When given the opportunity to dominate another tribe they did.

Europeans were simply further advanced in weaponry and tactics - end of story. Once tribes saw the advancement they traded for it and attacked their neighbors or joined forces with Europeans.

What happen in the Western hemisphere mirrored what happened in Europe decades before and and up to the 1700s. The Scottish Highland Clans were decimated by superior tactics over time as were the Irish by the English.