Originally mankind evolved in Africa which at a time was occupied by multiple pre-human species.

Unable to compete with its more sophisticated neighbours man migrated to the only landmass left largely unoccupied at the time.

Once the pre-human peoples diminished in number man ventured in all directions, the landmass that was the starting point was located were the mid-atlantic ridge now exists.

From this elongated continent man migrated in multiple waves, the initial migration happened well over 150.000 B.C and was followed by many others.

It is difficult to pinpoint when exactly the specific continents were settled but by 100.000 B.C man dominated every continent with a peak population of over 190 milion individuals globally some 32.000 years ago.