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.
In the 1820, eligible citizens casted their votes by creating a secret ballot. A secret ballot is a ballot where people would vote secretly. Thanks for asking us here at brainly! Feel free to ask more questions!
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The Romans got the idea from the Etruscans.
