The most accurate answer is
D. In the northwest of the United States
In the 1800's most American's lived in the East Coast
The reason why most Americans moved to the east was because
most of them would be slaves or farmers looking for their own land. Some people worked for people though like some people would farm others land.
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(4)Asia and Europe
The Silk Road began in China and ran westward through Asia ending in the Anatolia Peninsula.
The Silk Road was a trading route which brought Asian goods westward to Constantinople. The road began in Hangzhou and Guangzhou, both port cities in China. The road forked north and south going into the Indian peninsula and through the Persian Empire.
Answer:
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Boosted economic prosperity through expansion of trade especially due to the rapid expansion and development of the 7000 mile silk road. The building of this road ensured that trade in farm produce developed a great deal.
Slavery began in America as early as the 1800s