For example, 95% of cotton plants grown in the world today belong to Gossypium hirsutum that was domesticated in prehistoric times in Central America. Instead of that species, however, prehistoric South American farmers planted the Gossypium barbadense cotton with a close relative. Clearly, on the road to invading South America in prehistoric times, Central American cotton was so difficult that it was impossible to stop domestication of another cotton species here and vice versa. Chili, squash, amaranth, and chenopod are other crops that other species that are related to them have been domesticated in both Central America and South America because none of them is able to expand fast enough to stop them. to the domestication of those species.
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