For those who don't know, I am working on a timeline in which the black death kills 75% of Eurasia which in turn pushes technological advancements back and thus things such as advanced naval boats and advanced navigation and whatnot all don't come to fruition. The new world is eventually discovered by the late 1800s-early 1900s. The New World is left alone for hundreds of years. I'm not too knowledgeable on New world civilizations so I ask the people of this forum what will happen to the new world given this timeframe. Will we see an interaction between civilizations, the formation of new civilizations from native Americans up north, or even the rise of entire empires? Like I said I am no expert of pre-Colombian civilizations so I want to see what's possible based on what you all think.