Question

which statement best summarizes the connection the columbian exchange has with the atlantic slave trade?
the slave trade had started just before columbus discovered america, because the portuguese needed labor in china (macau) in the 1400s.
the columbian exchange and the atlantic slave trade are not connected.
the columbian exchange exposed europeans to new resources in which they were motivated to harvest, manufacture or mine; they needed slave labor to do this.
columbus brought slaves with him to settle the new world.

Explanation:

1. Analyze the first option: The Atlantic Slave Trade's main focus was not labor in China (Macau) for the Portuguese in the 1400s, and the timing and context are incorrect. Also, the slave trade's connection to the Columbian Exchange is not about labor in China.
2. Analyze the second option: The Columbian Exchange (exchange of goods, ideas, people, etc. between Old and New Worlds) and the Atlantic Slave Trade are highly connected. The slave trade was a part of the Columbian Exchange's movement of people, and the demand for labor in the New World (from resources discovered in Columbian Exchange) drove the slave trade. So this option is wrong.
3. Analyze the third option: The Columbian Exchange introduced new resources (like crops, precious metals, etc.) to Europeans. To exploit these resources (harvest crops, mine gold/silver, manufacture goods), there was a high demand for labor. Since indigenous labor was insufficient or died due to diseases, Europeans turned to African slave labor, which was a key part of the Atlantic Slave Trade. This option correctly explains the connection.
4. Analyze the fourth option: Columbus did not bring slaves with him to settle the New World initially. He brought people for exploration and colonization, and the large - scale importation of African slaves came later due to the labor demands from the resources of the Columbian Exchange. So this option is incorrect.

Answer:

The Columbian Exchange exposed Europeans to new resources in which they were motivated to harvest, manufacture or mine; they needed slave labor to do this.