By which century had agriculture spread widely throughout the Old World and much of the New World?

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By 1500 AD, agriculture had spread widely throughout the Old World and much of the New World. This is evidenced by the fact that civilizations like the Aztecs, Incas, and the various empires of Europe and Asia relied heavily on agriculture as a means of sustenance and prosperity. Additionally, many of the crops that are commonly grown and consumed today, such as wheat, rice, maize, and potatoes, were already being cultivated and traded by this time.

By Which Century Had Agriculture Spread Widely Throughout the Old