PROVIDENCE, R.I. — In a lecture disguised as dry economic history, a former president of Mexico delivered a diplomatic but increasingly frank, funny and ultimately cautionary characterization of the U.S. president Monday evening at Brown University.Ernesto Zedillo, who was president of Mexico from 1994 to 2000 and now directs the Yale Center for the Study of Globalization and sits on a long list of policy boards addressing world problems, described a "mini golden age" of [...]