The AG industry was able to provide way bigger amounts of food. With higher amounts and productivity gave farmers a easier time to keep up with the growing population around the world. more people means higher demand for food in larger quantities.
The themes that played a major role in changing the world between 1450 and 1750 was that plants were being spread together with animals and diseases between the Americas and the rest of the world; mainly Europe. Especially famous are cases where European contact wiped out whole villages and tribes of native American people because they were unable to cope with the bacteria and viruses.
White Sands Missile Range
C. The continuation of African traditions in the U.S.