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Because in the south there was more segregation. Also there was more land that had been untouched in the north. The property was also cheaper because of that reason. And since it was untouched a lot of businesses came in to drill for oil and other natural resources, which created the need for workers.
A strict policy of neutrality, the United States would not entangle itself with alliances with other nations.
Before the Civil War, the Free-Soil movement and the Republican Party embraced this idea for the American West: a territory reserved for small white farmers, unchallenged by the wealthy plantation owners who could buy up vast tracts of land and employ slave labor.
