How did the cotton gin affect the Southern economy? Choose four answers. It increased the demand for enslaved laborers.
It increased the speed at which cotton could be produced.
It increased the growth of farms and plantations.
U
It increased the demand for cotton.
It increased the demand for skilled workers.

d) all choices are correct

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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the anwser is a) to prevent military conflict