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In page White slavery:

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In the Roman Republic and later Roman Empire, slaves accounted for most of the means of industrial output in Roman commerce.[citation needed] Slaves were drawn from all over Europe and the Mediterranean, including Gaul, Hispania, North Africa, Syria, Germania, Britannia, the Balkans, and Greece. Generally, slaves in Italy were indigenous Italians,[1] with a minority of foreigners (including both slaves and freedmen) born outside of Italy estimated at 5% of the total in the capital, where their number was largest, at its peak.[citation needed]