What caused an increase in the number of slaves in northern english colonies

In 1501, shortly after Christopher Columbus discovered America, Spain and Portugal began shipping African slaves to South America to work on their plantations. In the 1600s, English colonists in Virginia began buying Africans to help grow tobacco.

Explanation:

length of the cultivating season was not a problem of new england agriculture

after world war ii, the united states and the soviet union were the major economic, military, and political powers. the world was bilateral multipolar bipolar unilateral

after world war ii, the united states and the soviet union were the major economic, military, and political powers. the world was bipolar.  

the great leap forward, mao zedong's plan to increase china's agricultural and industrial production, was an overwhelming success. true false

the great leap forward, mao zedong's plan to increase china's agricultural and industrial production, was an overwhelming success. true.

explanation: