The answer is D because of the emotion.
B is the awnser for that question
Answer:
Spain's • encomienda policy led to the enslavement of many natives. Spain created new colonies • and became enriched by conquering wealthy Indian empires in the Americas. By the 1400s, millions of Indians lived in the western hemisphere. Among them were the Pueblo, Navajo, and Apache in what is now New Mexico.
Explanation:
A reason why the Civil War lasted four years is that the Union had to fully conquer the South.