How long was slavery legal in the world?

How long was slavery legal in the world? As far as the institution of chattel slavery – the treatment of slaves as property – in the United States, if we use 1619 as the beginning and the 1865 Thirteenth Amendment as its end then it lasted 246 years, not 400.

As far as the institution of chattel slavery – the treatment of slaves as property – in the United States, if we use 1619 as the beginning and the 1865 Thirteenth Amendment as its end then it lasted 246 years, not 400.
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