Actually, most Europeans subscribe to a belief system in which all nature is our relative too; and certainly one in which Native Americans are our relatives. It's called evolutionary biology. But many of those same Europeans and Euro-Americans have no problem killing, raping and murdering their relatives.

The same has always been true of Native Americans, as previous posters on this thread have pointed out. Slavery, war, and exploitation--including one people driving out or politically dominating another--were not unknown among the native peoples of the US and Canada. There's no reason to assume they'd be unknown or even uncommon if natives were in charge today, either.

You also have neglected the southern half of North America (Mexico and points south), where large empires grew up based on the exploitation of land, slave labor, and human sacrifice.