They don't. The genocide and theft of land of their indigenous populations mostly happened less than 150 years ago. That land should be returned to indigenous sovereignty.
How that decolonization should proceed is a question not for the colonizers or their descendents to answer, but the indigenous tribes themselves.
Not just South america, but generally most countries south of the equator, outside the imperial core, who are making most of the products for the world while being paid miniscule wages.
I think the chat bots are, but the upvote bots sure know how to push the most rage-inducing and high-engagement posts to the top. Twitter, youtube, and reddit are very good at that now.