Because it was the mainstay of the cotton industry, which represented half the exports of the USA.
Most Northerners were not so passionately anti-slavery that they were ready to sacrifice the cotton revenues by abolishing it.
Northerners who went south during the reconstruction motivated by profit or idealism. many were actually interested in helping or freeing slaves.
Because they regarded the Union as sacred - also they didn't want to lose the cotton revenues.
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.
To save the cotton revenues.
Northerners who moved to the south for profit oppurtunities were called carpetbaggers.
They wanted to hold on to the cotton revenues, which were over 50% of the exports of the USA. And slavery was the mainstayof the cotton industry.
Cotton consumers, such as clothiers, pay less for cotton and generally speaking will make more profit. Cotton producers will get less money for their product, and generally speaking make less profit.
Slaves Harvested and Planted the cotton and the Wealthy plantain owners got the profit
Because it was the mainstay of the cotton industry, which represented half the exports of the USA.
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.
Most Northerners were not so passionately anti-slavery that they were ready to sacrifice the cotton revenues by abolishing it.
Profit per pound of cotton skyrocketed and with it the amount of cotton planted for harvest. United States cotton exports rose 6,000% between 1790 and 1815.
Northerners who went south during the reconstruction motivated by profit or idealism. many were actually interested in helping or freeing slaves.
Because they regarded the Union as sacred - also they didn't want to lose the cotton revenues.
here was no profit in it for most northerners and it would provide a way for wage slaves to find opportunities somewhere besides in the north. They wanted cheap labor and the west would slim the pickings provided by desparation and poverty.