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Slaves in the Arab/Ottoman world could purchase their freedom, were not enslaved by race (rather as POWs), their children were free, had some legal protection, and had the potential for upward mobility (in rare cases slaves that became viziers, ministers, or kings). Also Arab society post-Islam highly encouraged freeing slaves (considered a major virtue/source of reward/form of penance).

May be more accurate to say slavery in the US was less brutal than slavery in the French Caribbean or Spanish Argentina.