It isn't right to generalize, because the North's populace did not all hate slavery, and the South's did not all support it. In your generalized terms, both the North and the South wished for the new states out west to have slavery laws in accordance with their positions. This almost led to war, but several compromises were made: The Missouri Comprimise, the Comprimise of 1850, and other deals, such as the Three Fifths Comprimise.
However, these only delayed war, and events such as Bleeding Kansas were instrumental in starting the Civil War
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With great misgivings, as they saw the expansion to the West as an effort by the northern States to create new abolitionist States there that would finally together with the North outnumber them and force them to abolish slavery.
To try to maintain their voting power in Congress.
its because the railroads goes more to the east and the west
West African slaves could escape their bondage.
Slavery in West Africa started as early as the 7th century. Slavery in West Africa reached it's peak when slave traders would trade slaves for use in the Americas.