the broad east-west axis of Eurasia meant that newly domesticated crops could easily spread across zones with similar climates, whereas the north-south axis of the Americas prevented it. Similarly, new infectious diseases that arose in humans from animal domestication spread in waves across Eurasia, leaving survivors with immunity. All this led to the Eurasian population developing the tools of civilization before the rest of the world, resulting in the guns, germs, and steel that permitted them to dominate other continents.
Interesting.the geo factor of cultural Becoming. The reason behind west hegemony
