Which two sentences explain the north's opposition to the use of slavery in the south?
the slave population increased the south's representation in congress.
northerners saw slavery as an immoral and unjust practice.
northern farmers couldn’t compete with southern plantations supported by slave labor.
southerners refused to trade slaves with plantation owners in the north.
the north believed that slavery prevented the south from using modern farm equipment.

Northerners saw slavery as an immoral and unjust practice.Northern farmers couldn't compete with Southern plantations supported by slave labor.

Explanation:

The practice of slavery was very cruel and the slaves were treated horrifically.There were many slaves working the Southern plantations, and they gained more wealth because the plantation owners didn't pay the workers.

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