Wrong. The Thames River was at one point one of the filthiest bodies of water in the world, this was because flushing systems were not used by white people until way later. White people did not learn how to bathe or have basic hygiene until the Moorish people taught them how. Slaves were made to throw buckets of their shit out the window, where they would occasionally land on someone's heads, killing them. They weren't "gifted" with millions of $$$ in labor, per se, because they stole it, slavery was stolen free labor. So no, it was not off their "own back".