Answer: the invention of cotton gin
Explanation:The cotton gin refers to a a machine that sets aside cotton fibers from their seeds. Therefore, the invention of the cotton gin transformed the cotton industry in the United States and demanded cheap labor force, which led to the rise of slavery in the South and to the American Civil War later.
Because it makes the water flow faster
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Answer:
A native of Hampton, Virginia, she graduated from Hampton Institute in 1942 with a dual degree in Math and Physical Sciences, and accepted a job as a math teacher at a black school in Calvert County, Maryland.
Explanation:
