Select the correct answer.
What was the effect of the invention of the cotton gin on the United States in the first half of the nineteenth century?

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Explanation:

The invention of the cotton gin was a revolution in the cotton industry. Due to the manner in which this sector was exploited in the US, it led to a large increase in slavery in the Southern states, in order to meet the constantly growing demand for cotton using a larger workforce.

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by 1880, germany had more rail lines than great britain and russia.