Why was the word "Columbian" used to describe the exchange?

Columbian

Explanation:

The term Columbian is used to describe the exchange in America. It only began after Christopher Columbus discover America and began the trade known as Columbian Exchange. Spanish settlers made trading connections with the natives and exchange goods and materials. They also started establishing colonies in the New World.

not too sure on this one thinking tyo organize the division of africa

  the common sense as a pamphlet written by thomas paine. it promoted the independence of the colonies from british rule. the distribution of this pamphlet was great, it reached people everywhere and it was even read aloud at places people met. it also unite the colonists before the revolutionary war.

answer is d