Slaves were brought from africa to grow which crop ?

Sugar.

Explanation:

Sugar cane was brought by Christopher Columbus during his 1492 expedition to the Dominican Republic. Soon enough, settlers understood they needed more manpower to plant, harvest and process the crops.

Since the early 16th-century, sugar, called White Gold by the British colonists, became the motor of the slave trade that transported Africans to the Americas. The sugar cane plantations that had been developed as cash crops by European superpowers became key in the history of the Caribbean, South America and some regions of the South in the United States.

b]to spread the message of black power

the soviet union wanted to impose communist governments in eastern europe.