Sorry, we don't allow throughout history questions. These tend to produce threads which are collections of trivia, not the in-depth discussions about a particular topic we're looking for. If you have a specific question about a historical event or period or person, please feel free to re-compose your question and submit it again. Alternatively, questions of this type can be directed to more appropriate subreddits, such as /r/history or /r/askhistory.

We run into issues when we try to quantify 'unknownness in society', it's a frankly impossible metric to work off of. I think it's pretty clear that general society knows genocide was committed against Native Americans, Africans, and Aborigines Australians alike but feel it's so far back it's not important to them or they don't think about it. It's a pretty common topic at least in my Floridia-based education. Perhaps a co-question on /r/AskSocialScience about the perceptions of genocide in society would be in order?

Regardless my principle work on genocide would be Ben Kiernan's absolutely thick work Blood and Soil: A World History of Genocide and Extermination from Sparta to Darfur. Pages 72-164 in particular deal with genocide in Central America/Caribbean by the Spanish between 1492-1600 and Genocide/Genocidal Massacres in East Asia from 1400-1600. What Kiernan calls "Settler Colonialism", his second part of the book (p. 165-393), covers 1600-1776 North America, U.S. 19th century genocide, Australian Aborigines genocide, and African genocide in the 19th/early 20th century.

This would be the work I would start with if you're interested in 'Native genocide', in short. Its $15 used and $25 new on Amazon so it's very affordable as well.