The “railroad” is thought to have helped as many as 70,000 individuals (though estimations vary from 40,000 to 100,000) escape from slavery in the years between 1800 and 1865.
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Peterson of Brigham Young University, Korea has the longest unbroken chain of slavery of any society in history (spanning about 1,500 years), which he attributes to a long history of peaceful transitions and stable societies in Korea.