[QUOTE=Lissa]
People were fast finding out that you could pay workers a lot less than it cost to feed, house and clothe them. Owners had an incentive to treat their slaves well because if one sickened and died, they were out of their invetment. Industrialists were discovering that employees were expendable-- there was always a supply of people desperate for work.
[/QUOTE]
Which is exactly the reason slavery had become less common in the north.
[QUOTE=Lissa]
Northerners didn’t eliminate slavery because they had high-toned moral values. They did it because they didn’t need slaves anymore anyway.
[/QUOTE]
I’m glad to see someone around here knows that.
[QUOTE=Lissa]
Once a slave’s labor is worth less than it costs to house him, the slaveowners would have gladly kicked them to the curb. They probably would have patted themselves on the back for their enlightened ethics, too. 
[/QUOTE]
Exactly. Even the dumbest of us southerners could figure out that a John Deere tractor doesn’t cost anything when it’s not working. Slavery was doomed to extinction by industrialization.
In case anyone is interested, there is some very interesting reading to be found here.
http://www.scv674.org/SH-Table.htm
If you’ll bother to read, you’ll find that secession was threatened by some states long before the Civil War. Not just by southern states and not over slavery.
Also, at that time slavery was protected by the Constitution. The North didn’t have enough drag to amend the Constitution. So a war over slavery wasn’t necessary.
Slavery was definitely a hot issue at the time. But, it wasn’t the reason South Carolina seceded. They seceded because of the passing of the Morrill Tariff.
“The original Morrill Tariff law passed and was signed into law by lame duck President Buchanan the Pennsylvania protectionist, on 2 March 1861, just before the Sumter incident, and was cheered in parts of the Northeast, and particularly in Pennsylvania for economic protection. Half of the iron of the country was made in Pennsylvania. United States federal tariff revenues had fell disproportionately on the South, which paid for 87% of the total collected. While the tariff protected Northern industrial interests, it raised the cost of living and commerce in the South substantially. It also reduced the trade value of their agricultural exports to Europe. These combined to place a severe economic hardship on many Southern states. Even more galling was that 80% or more of these tax revenues were expended on Northern public works and industrial subsidies, thus further enriching the North at the expense of the South.”
“The act sponsored by Justin S. Morrill and Thaddeus Stevens raised the average tariff from about 15% to 37% with increases to 47% within three years. This was reminiscent and even higher than the Tariffs of Abomination of 1828 and 1832, which had led to a constitutional crisis and threats of secession.”
" To the South it was viewed as a mortal threat, for Dixie exported three-fourths of all she produced and imported much of her manufactured goods, in spite of the enormous import tariffs that were already in existence. With Lincoln’s Morrill Tariff, the South would be forced to pay even higher prices for imports or find northern replacements, which would then help pay for the northern industrial revolution. Either way, southern wealth would be siphoned off into the pockets of northern industrialists or President Lincoln’s federal government."
I included these quotes from the linked article for those who wouldn’t bother to read through it for themselves.
The Civil war, like most wars, was fought over money and power. Those who had it wanted to keep it and those who didn’t have it, wanted to get it..