Rep. Yvette Clarke (D-NY) went on the Colbert Report last night where she contended that the Dutch continued the practice of slavery in Brooklyn in 1898.
Of course, as the Politicker notes, the Dutch "lost control of its colonies in the area to England in the 1674 Treaty of Westminister. Also, the Thirteenth Amendment to the U.S. Constitution officially outlawed slavery in 1865."