Answer:
D. Spanish Colonization
Step-by-step explanation:
Spanish Colonization started when Christopher Columbus found the Natives and turned them into slaves and made them mine gold for his own profit, he also tried to sell them away as slaves. When more people started to come to America during the Spanish Colonization, diseases and illnesses killed many Native Americans as they had no illness resistance. Lots of Natives were also forced into slavery by the Spanish, mostly in mining as lots of gold and other profitable materials were there. Eventually, as many of the Natives kept dying of diseases the Spanish decided to get African Americans for slaves instead as they had a better resistance against diseases and illnesses.