The best explanation for how humans populated the earth is

The "out of Africa" theory, proposed by Charles Darwin, is the best explanation for how humans populated the Earth. They used to be very migratory and before they eventually settled down, had spread out all over the world. They originiated in Africa, crossing over a land bridge in Beringia to get to the Americas. This can be proven by tracing differences in genes such as MC1R.

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Where people were very broke no jobs were available and everyone was struggling