Yeah, but Spain had a stable economy before people even knew about North America.
It's which country enforced slave labor the longest is the worst IMO, not necessarily the country who was last to abolish it... that could be any number of countries. China still has borderline slave labor, with children.
Jews, on the other hand, suffered 2000 years of slavery... and since America isn't near 2000 years old...
Jews didn't suffer '2000' years of slavery; it was all fairly relative for the jews. They undertook 3-4 centuries of slavery in Egypt and around a century or two in babylon.