What area of the country was urbanized the most in the us during the period of the civil war?

The north was urbanized, the South was agrigarian, consequently the thinking of the two sections were vastly different. The influx of immigrants to the north greatly influenced their need for cheap labor (which the slave was not, actually). The Irish I

Migrants, etc filled the labor force needs, but not the need for the money made by shipping slaves. The cheap labor from immigrants and the weather conditions made the urbanization of the north more conducive