But as I have posted, the feelings of the Founders were not uniform, even most of the slave owners despised slavery, but saw no other way...."for now". You can at least tip your hat to John Adams, and John Quincy Adams, against slavery and VOCAL about it, same with Franklin. Adams letters to Jefferson rarely omitted a rebuke because Jefferson owned slaves.
I'm sure the Founders saw no way out that wouldn't crash the economy of their day.
It is worth noting other countries outlawed slavery without resulting to Civil War.
King Cotton cast a long shadow between Valley Forge and Cold Harbor:
"In the 1830s, hundreds of millions of acres of conquered land were surveyed and put up for sale by the United States. This vast privatization of the public domain touched off one of the greatest economic booms in the history of the world up to that time.
"Investment capital from Britain, the Continent and the Northern states poured into the land market. 'Under this stimulating process, prices rose like smoke,' the journalist Joseph Baldwin wrote in his memoir, 'The Flush Times of Alabama and Mississippi.'
"Without slavery, however, the survey maps of the General Land Office would have remained a sort of science-fiction plan for a society that could never happen.
"Between 1820 and 1860 more than a million enslaved people were transported from the upper to the lower South, the vast majority by the venture-capitalist slave traders the slaves called 'soul drivers.'
"The first wave cleared the region for cultivation. 'Forests were literally dragged out by the roots,' the former slave John Parker remembered in 'His Promised Land.'
"Those who followed planted the fields in cotton, which they then protected, picked, packed and shipped — from “sunup to sundown” every day for the rest of their lives..."
"When the cotton crop came in short and sales failed to meet advanced payments, planters found themselves indebted to merchants and bankers.
"Slaves were sold to make up the difference.
"The mobility and salability of slaves meant they functioned as the primary form of collateral in the credit-and-cotton economy of the 19th century.
"It is not simply that the labor of enslaved people underwrote 19th-century capitalism.
"Enslaved people were the capital: four million people worth at least $3 billion in 1860, which was more than all the capital invested in railroads and factories in the United States combined.
"Seen in this light, the conventional distinction between slavery and capitalism fades into meaninglessness."
http://opinionator.blogs.nytimes.com/2013/03/30/king-cottons-long-shadow/?_php=true&_type=blogs&_r=0