Graeber / Wengrow 185: "[P]erhaps a quarter of the indigenous Northwest Coast population lived in bondage--which is about equivalent to the proportions found in the Roman Empire, or classical Athens, or indeed the cotton plantations of the American South"
However, "Amerindian slavery had certain specific features that make it very different from ancient Greek or Roman household slavery, let alone European plantation slavery in the Carribean or in America's Deep South" (187)