What was an effect of the movement of foods like corn and patatoes from the western hemisphere to the eastern hemisphere

Food slike corn and potatoes that are native to the "americas" and cultivated by indigenous people were taken to Europe where the potato allowed the population in Europe to increase because it was an easy-to-grow and hearty food item. Corn was often used in Africa and fed many hungry and starving populations in Africa.

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.