What was the effect of the invention of the cotton gin on the united states in the first half of the nineteenth century?
the focus of economic activity in the south shifted from agriculture to industrial production.
the south became more dependent on slavery, deepening the differences between the south and the north.
industrialists from the north migrated to the south in large numbers to set up textile mills and shipping firms.
large numbers of plantation workers in the south lost their jobs and moved north in search of jobs.

Hi!

The answer would be B or the second option. The South became more dependent on slavery, deepening the differences between the South and the North.

Explanation:

So the "gin" (short for engine), was a small machine invented in the 19th century to help workers separate the seeds from the fibers in short-staple cotton. Although cotton still needed to be picked by hand, the cotton gin improved the efficiency in which cotton was produced and the demand for cotton roughly doubled each decade after.

So cotton became a very profitable business that  demanded a growing slave-labor force to harvest it.

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