When American Airlines Flight 157 wheeled up to the customs shed at Mexico City's airport one day last week, a mariachi band struck up Guadalajara. After a suitably dramatic pause, smiling Sloan Simpson O'Dwyer, wife of the 41st U.S. envoy to Mexico, appeared in the plane's doorway, slim in a dark suit and rust-colored hat. Ambassador William O'Dwyer followed her into the morning sunshine.
Sloan was swept into a series of abrazos from the women in the unofficial welcoming party, emerging with two bouquets and smeared lipstick. Somewhat eclipsed, the new ambassador listened...