fugitive slave, any individual who escaped from slavery in the period before and including the American Civil War.
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First off, let's talk percentages - if the numbers in the question are correct, we're talking 1000004000000=2.5% of all slaves escaped - which is an incredible percentage. This wasn't just a few people - this is a significant percentage of people held as slaves that managed to escape.
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.