Main cause was the black death
I remember this it was D. He saw no other way to keep the United States together
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To prevent the spread of communism in Southeast Asia is why did President Kennedy get the United States involved in the Vietnam War so the reason was the usage of containment policy.
Answer:
The Columbian Exchange introduced all of the following to EUROPE except: Tomatoes.
Explanation:
Christopher Columbus transported sugar plants, horses, and disease to the New World while promoting the foundation of New World materials like sugar, potatoes, chocolate, and tobacco to the Old World. The method by which products, people, and viruses traversed the Atlantic is recognized as the Columbian Exchange.