Because of the invention of the__cotton became the foundation of the southern economy.

The cotton gin

Explanation:

When Eli Whitney invented the cotton gin it provided a quicker method when it came to picking the seeds out of cotton. The faster the seeds could be picked out the more the plantation owners wanted a faster way to pick cotton.

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the lowest among the social higher rank were the working class. this class remained detached to the political progression   of the country and was hostile to the other two classes