NotHardUp1
What? Me? Really?
Yes, the obtaining of resources. Didn't matter that there were already people there who had first rights.
The "rights" to hold any resource, be that land, timber, labor, women, or water, have always depended upon the ability of a people to defend and protect said resource.
When the America's were conquered, rights were denied. When one European or Asian country invaded another, rights were denied. Much is made of the American conquest because the conquest of "indigenous" peoples elsewhere happened in varying degrees over many more centuries.
Greeks, Persians, Babylonians, Goths, Mongolians, and an endless list of others slaughtered and plundered. Genghis Khan has a hugely disproportionate number of descendants in Asia, not because he was the hottest thing in disco pants, but because he and his men slaughter massive amounts of population and bred the women who survived.
It was the way.
And there were many other armies who decimated villages, raped and left.
The Irish can tell you more about the application of the winner-takes-all principle, as can the Basques, the Tamil, and on and on.
Perhaps the pushback against the American conquest is against the supposed "civilized" people who brought it. But, the Boxer Rebellion happened in parallel, and it was against all the European colonialists for similar abuses and enslavement.
The Native Americans did and do suffer, but the challenge always has been and will be to either retake, coexist, or assimilate. Looking backward is part of the problem in many ways as has been claimed by many young Natives themselves.
It's not a question of justifying, but of figuring out a path forward. Lots of property rights have been abrogated over many centuries. Surprisingly, the ones with the wealth, the weapons, and the lawyers win.

