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Prior to the civil war, the region where most of the people lived (and most of these in cities due to the big amount of industrialization and urbanization going on) was the Northeast region. After the civil war, this has changed to some degree.

Correct answer:

Northeast region.

The northern region of the United States consisted of four separate areas New England, the Mid-Atlantic states, the Old Northwest and the Great Plains. Historically these regions have been identified as the free states that opposed slavery where more people lived before the Civil War and opponents of the Confederacy during that war.