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'''''The Underground Railroad''''', was a network of people who helped [[fugitive]] [[slave|slaves]] s escape to the North and to [[Canada]], . It was not run by any single organization or person. Rather, it consisted of many individuals -- — many whites but predominently predominantly blacks -- — who knew only of the local efforts to aid fugitives and not of the overall operation. Still, it effectively moved hundreds of slaves northward each year -- — according to some estimates, the South lost 100,000 slaves between 1810 and 1850.