When did the Mexicans move to Mexico (History)?

[Strawberryfieldsforever]

And if they were in the Ice Age, and they migrated to different parts, does that mean we are all related and are just different ethnicity due to Sun?

 

[A. Kari]

We are all related, but we have diverged physically because of the environments our ancestors adapted to.
Where it was sunny, people developed dark skin. Not so sunny, lighter skin.
The Native American populations of North and South America came into the "New" World during the Ice Age from the land bridge connecting Asia to North America.