By Elvis Obanor In international diplomacy, moral language is abundant, but moral courage is scarce. That distinction was on full display this past week when the United States voted against a recent resolution at the United Nations recognizing the transatlantic slave trade as among the gravest crimes against humanity. Washington’s explanation was flawlessly tidy, eloquently lawyerly, and entirely predictable. Deputy U.S. Ambassador to the U.N. Dan Negrea, in his statement, ca