[wassenaar10]

> America also became a major economic engine of the world by exerting control over people's bodies without paying them.

The actual economic data doesn't support that. Slaves were never more than 17% of the population, slavery was only ever legal in certain regions, and use of slaves was mostly relegated to a subset of agricultural labor. Moreover, slavery was outlawed in 1865 and the United States would not be considered an "economic engine of the world" until at least the 1880s, and it would not be considered one for its agricultural output but for its industrialized economy.

Furthermore, countries in the new world (e.g. Haiti, Brazil, that practiced slavery for longer and on a larger scale failed to develop strong economies anywhere to the degree that the United States did, so the line from "had slavery in the past" to "became economically prosperous" is tenuous. In fact, slave labor (and adjacent systems like serfdom) historically tends to hamper economic growth, prevent industrialization, and stifle innovation.