>From Wikipedia Historical migration of human populations begins with the movement of *Homo erectus <http://en.wikipedia.org/wiki/Homo_erectus>* out of Africa across Eurasia <http://en.wikipedia.org/wiki/Eurasia> about a million years ago. *Homo sapiens <http://en.wikipedia.org/wiki/Human>* appear to have occupied all of Africa about 150,000 years ago, moved out of Africa 70,000 years ago, and had spread across Australia<http://en.wikipedia.org/wiki/Prehistory_of_Australia>, Asia <http://en.wikipedia.org/wiki/History_of_Asia> and Europe<http://en.wikipedia.org/wiki/Paleolithic_Europe>by 40,000 years. Migration to the Americas<http://en.wikipedia.org/wiki/Models_of_migration_to_the_New_World>took place 20 to 15,000 years ago, and by 2,000 years ago, most of the Pacific Islands <http://en.wikipedia.org/wiki/Pacific_Islands> were colonized. Later population movements notably include the Neolithic Revolution<http://en.wikipedia.org/wiki/Neolithic_Revolution>, Indo-European expansion <http://en.wikipedia.org/wiki/Proto-Indo-Europeans>, and the Early Medieval Great Migrations<http://en.wikipedia.org/wiki/Migration_Period>including Turkic expansion <http://en.wikipedia.org/wiki/Turkic_migration>.