Slavery was not free. The slaver still had to guard, feed, house, and provide medical care. Contrary to common belief, the only industry where it was profitable to use slaves was cotton. (One reason the South failed to industrialize.) One of the problems the South had was even that was becoming steadily less profitable.
The US became the dominant economic power of the world because of free (as in freedom) labor.
Slavery was not free. The slaver still had to guard, feed, house, and provide medical care. Contrary to common belief, the only industry where it was profitable to use slaves was cotton. (One reason the South failed to industrialize.) One of the problems the South had was even that was becoming steadily less profitable.
The US became the dominant economic power of the world because of free (as in freedom) labor.