The most important economic development in the mid-19th-century south was the cotton gin.
Answer: By vote
Explanation:
Voting is one of the major forms by which laws are implemented in the Congress, despite how good or bad they are, they would still need to be voted for by the Congress members. Voting gives everyone a voice within the Congress members, so decisions are not taking selectively or in favour of a particular section. The Indian removed act was also passed by voting and was signed into law by President Jackson.
States in deep south broke away so they could continue slavery but states in upper south supported ending it