Yeah, it's a sad business. People with superior military power have been stealing land and resources from other people for as long as history has been recorded.

One reason that many Indian tribes allied with the Whites was to get back at other Indian tribes who were traditional enemies. In Mexico, for example, virtually all the other Indians allied with the Spanish to fight the Aztecs...little realizing that the Spanish would turn out to be even worse than the Aztecs once they took over.

(Not that the Aztecs were any fun to have as neighbours! They were a vicious empire.)