How many people would be interested in what they are selling would be the most influential.
Charles Dickens wrote novels about urban poor in the 1800s
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Generally speaking, "A. the average election results of the President of the United States" would not be considered an example of geography's impact on history, since this has little do with with geography in the United States.
Sectionalism became very tensed in the late 1940s because of the separation of the North and the South because of the slavery. People in the North were focusing on industrializing, urbanizing, and building factories while the people from the South concentrated in agriculture. The Southerners was claiming that the North's factories weren't treating everyone fairly and lead into a war.
C. The government regulates the economy completely