What is the most likely scenario where one European country ends up controlling all of the Americas until at least the late 1700s. How do two entire continents under one flag develop from there? The first part of this scenario is the challenge I pose, and it can be done by any means. The second part is a big nature vs nurture test for the western hemisphere pretty much. That is to say if North and South America had the same “nurture” as in the same colonial ruler. This is obviously very difficult but I don’t believe it’s impossible, so please indulge me if you will. My favorite idea for this is England winning the Hundred Years’ War while having iberia remain divided, but any scenarios are welcome.