We would probably be more akin to European country demographics with a lot more Mexicans and that general region living here. This won't be the case for more than a couple thousand years though. Soon, there will be a full connection of travel across the world that will merge the entire human species into basically one single 'race' when enough time has passed. Skin tones are a thing because of melatonin levels and distance from the Equator, but we have stalled evolution in humans to the point where only the very extreme things would be enough to cause any noticeable change. This is especially true due to our enhanced life spans and massive population size.
We would probably be more akin to European country demographics with a lot more Mexicans and that general region living here. This won't be the case for more than a couple thousand years though. Soon, there will be a full connection of travel across the world that will merge the entire human species into basically one single 'race' when enough time has passed. Skin tones are a thing because of melatonin levels and distance from the Equator, but we have stalled evolution in humans to the point where only the very extreme things would be enough to cause any noticeable change. This is especially true due to our enhanced life spans and massive population size.