Why were southerners fearful of the rebellion and other rebellions?

Slave rebellions were a continuous source of fear in the American South, especially since black slaves accounted for more than one-third of the region's population in the 18th century. Laws dictating when, where and how slaves could congregate were enacted to prevent white southerners from worrying.

Explanation:

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on the morning of  july 21,  1861, general mcdowell ordered the  unionarmy to attack. it was on this hill that  confederate  colonel thomas jackson and his forces held back theunion  troops.