Tomorrow marks the 79th anniversary of the beginning of the end of the U.S. prohibition on alcohol. On that day in 1932 John D. Rockefeller Jr., a vociferous advocate of temperance, called for the repeal of the 18th amendment in a letter published in the New York Times. Rockefeller had spent hundreds of thousands of dollars lobbying for the constitutional prohibition on alcohol. But his letter did more than admit the error of his investment. Because of his moral authority on the matter, it effectively ended the conservative taboo against admitting that the whole experiment had failed.