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The first slaves were introduced into the English-American colonies by a Dutch trader, who, in 1619, sold twenty of them to the settlers at Jamestown, Va.
Explanation:
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The southern economy remained largely agricultural mainly due to agriculture's importance to the colonies as a trade export (especially cotton, tobacco, and other cash crops).
This answer depends greatly on the time period in question, but generally speaking it is true that the presence of many rivers and mountains protected China from invaders, and allowed their culture to grow with little outside influence, with the exception of Mongolian invasions from the north.
