Which of these to make the economic divisions between upcountry and lowcountry regions less dramatic in the early-1800s?

There are no options given, but historically speaking it was the invention of "Cotton Gin".

A cotton gin was a revolutionary invention which enabled people to easily separate cotton fibers and seeds; previously it used to take a large time sorting it manually. The inventor behind this was Eli Whitney. The processing was made easy but still slaves were needed to grow cotton.

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In the postwar period, under a melancholic and bellicose climate, the literary genre that developed most strongly was the war literature. This genre, which had been sketched in Napoleon's times, carried the trenches and battlefields as a backdrop.

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