Because it was the mainstay of the cotton industry - America's biggest export.
But Northerners were not keen to see any extension of slavery, because that would reduce the Northern majority in Congress, and their power to levy protective tarrifs on imported goods which the South needed most, having no industry of their own.
Naturally there were many Northerners who were Abolitionists, but they were more vocal than numerous.
Some northerners believed slavery was morally wrong. Southerners believed slavery was an essential part of their lives.
Federalists
The southerners wanted slavery to end but northerners didn't want that
Yes.
Their was no money
slavery
Free Soilers
Some northerners believed slavery was morally wrong. Southerners believed slavery was an essential part of their lives.
Northerners were completely against slavery, and before the Civil War they took their hatred overboard by killing Southerners for their slavery.
no.
Many Northerners were for the proclamation that ended slavery. However, there were Northerners who felt like Southerners and opposed it.
Federalists
many northerners learned about slavery by personal contact with slaves.
Harriet Beecher Stowe was a very spiritual person, with a great faith in God. Her plea to Northerners was to erase slavery by doing the following:1. Personal conversion to be intolerant to slavery; 2. Pray to God for the end of slavery; and 3. To invite their Black neighbors to their white schools, churches and into their homes.
The northerners felt slavery was bad, although they bought cotton from the south that the slaves made. The southerners felt slavery was very useful to make and sell goods.
The southerners wanted slavery to end but northerners didn't want that
Yes.