Answer:
B. House of Burgesses.
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Answer:
A.
Explanation:
Zheng He was a Chinese explorer who was considered the most important "crossroad of trade".
I'm pretty sure the answer is D. poor working conditions, because people back then were very serious when it came to working, since they needed the money badly. All of the other answer choices are factors that led to the Great Depression.
They created the number system and discovered that the earth was round by studying eclipses.
Hope this helps.