Anyone looking at a language map of the Americas can see that its appearance is qualitatively different from that of Eurasia or Africa, with dozens of language families restricted to small territories, compared to the vast swaths of territory in Eurasia and Africa inhabited by people who speak closely related tongues in the Indo-European, Austronesian, Sino-Tibetan, and Bantu language families, each of which reflects a history of mass migrations and population replacements. The First American expansion seems to have been so fast that the languages of the continent are related by a rake-like
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