The Market Revolution brought capitalism and industrialization to the North and West (what is today the Midwest), as finished products from the Northeast were shipped, via road, railroad, and canal, to other parts of the country. The North became a center of industry, and northerners were committed to a system of free labor. While some northerners opposed slavery on moral grounds, others opposed slavery because it prevented the growth of opportunities for free laborers. When new states were added to the Union, such as in the Missouri Compromise of 1820, the North wanted the new state to be free, while the South wanted to continue to add slave states to the Union. However, the South largely did not industrialize and remained agricultural and committed to a system of slave labor. These economic differences and tensions over the addition of new states contributed to the causes of the Civil War.
In addition, the Market Revolution tied the North to the Midwest, as canals, and later, railroads, were used to ship raw materials from the Midwest to the Northeast. The South, which largely lacked canals and railroads, became increasingly left out of this trade. Over time, the South also became more isolated socially because it was not part of the trade routes from one section of the country to the other. This isolation helped contribute to the tensions leading to the Civil War.