From what I read about the first people here:
1. They were not Asian because they did NOT have round heads.
2. They were not African because it would have been too far for them to travel and there were no overland routes from Africa.
3. They were Caucasian types whose remains were found at the bottom of the pits the locals dug. The hunters would drive the beasts (mastodons/mammoths) into the pits they had dug. Then, of course, someone or two would have to jump into the pit and kill the beast.
Occasionally, I'm sure, some human hunter would get killed. Thus the human remains at the bottom of the pit. Their skulls were our shape.
That's how I learned it.