The Presidential election caused the lincoln douglas debates
They were debating about their beliefs, for example slavery and what they thought about it
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Answer:
a. A. Zheng He's various expeditions
Explanation:
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The answer is they had never experienced European
diseases before. Since they never encountered these kinds of diseases
before, their bodies had no resistance to them.
When they were exposed, the effect was devastating as many perished upon
contracting the diseases.