The invention that transformed the southern cotton economy was a. the sewing machine. b. the mechanical cotton-picker. c. the cotton gin. d. the steamboat.

C. The cotton gin.

The Cotton gin allowed cotton to be quickly processed, which was made to help with the process of deslaving the south. However, it led to a growing number of slaves, as the masters wanted to make more profit.

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answer: sure

explanation:

.elections are held to determine who serves in congress.