What encouraged sectionalism in 19th century?

Sectionalism in the 19th century

In the United States

Sectionalism in 1800s America refers to the different lifestyles, social structures, customs, and the political values of the North and the South. ... Southerners defended slavery in part by claiming that Northern factory workers toiled under worse conditions and were not cared for by their employers.

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explanation:

c) troops march forward in close formation against newer, more accurate weapons