Paleolithic migration prior to end of the Last Glacial Maximum spread anatomically modern humans throughout Afro-Eurasia and to the Americas. During the Holocene climatic optimum, formerly isolated populations began to move and merge, giving rise to the pre-modern distribution of the world's major language families.
In the wake of the population movements of the Mesolithic came the Neolithic Revolution, followed by the Indo-European expansion in Eurasia and the Bantu expansion in Africa.
Population movements of the proto-historical or early historical period include the Migration period, followed by (or connected to) the Slavic, Magyar, Norse, Turkic and Mongol expansions of the medieval period.
The last world regions to be permanently settled were the Pacific Islands and the Arctic, reached during the 1st millennium AD.
Since the beginning of the Age of Exploration and the beginning of the Early Modern period and its emerging colonial empires, an accelerated pace of migration on the intercontinental scale became possible.