Wrong. There's nothing more socialistic than slavery in a socialistic system. The USA had slavery within a capitalistic system. Slavery in the north and the South would have disappeared, like it did in all other slave countries of the era, because of the Industrial Revolution and new farm equipment. Slavery was no longer economical.
Today the USA has slavery because of socialism. And we are hopelessly locked into it. We are slaves to the IRS, Social Security, Federal regulations on business and commerce, slaves to the Federal courts, etc.
The slavery we live under now will become as bad or probably worse than any slavery in the USA of 150 years ago.
BTW, if lincoln had been allowed to package his methods of ending slavery, into a global vision, the death toll would have been staggering.
As it turned out, all other slave countries in the world, ended slavery at a conference table without firing one shot.