Pre-1492 American and Eurasian ecosystems exist in complete isolation.
1518 Charles V of Spain grants a license to sell African slaves in America’s Spanish colonies.
1519 Spanish conquistadors bring horses to Mexico.
c.1520 Spanish settlers introduce wheat to Mexico.
c.1528 Spanish traders introduce tobacco to the Old World.
c.1570 Spanish ships bring the first potatoes to Europe.
1619 Dutch traders bring Africans from a captured Spanish slave ship to Jamestown, Virginia.
1620 The Pilgrims bring livestock such as chickens and pigs to Massachusetts.
The arrival in the 1490s of the first Europeans in North and Central ...