Roads canals and railroads helped move people west because then supplies could get to people living in the west
Answer: The argument has often been used to diminish the scale of slavery, reducing it to a crime committed by a few Southern planters, one that did not touch the rest of the United States. Slavery, the argument goes, was an inefficient system, and the labor of the enslaved was considered less productive than that of a free worker being paid a wage.
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