Question

after which invention people started migrating colder region
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Answer 1

Explanation:

Basically as soon as humans learned to make tools and make clothing from animal hides, they were able to comfortably live in colder climates so they moved there where there were less people to compete with.

Answer 2

Answer:

The recent African origin paradigm suggests that the anatomically modern humans outside of Africa descend from a population of Homo sapiens migrating from East Africa roughly 70–50,000 years ago and spreading along the southern coast of Asia and to Oceania by about 50,000 years ago.

Explanation:

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