I began the week reminiscing about my travels with four secretaries of state, so I thought I’d end it by answering another question I’m frequently asked: What happened to the three secretaries I covered before Hillary Clinton? Starting with the most recent, they are Condoleezza Rice, Colin Powell and Madeleine Albright.

I’ve also been asked often about the differences between those former chief U.S. diplomats, especially during travel. I usually point out an obvious similarity among them first: None of them is a white male. In fact, the last secretary to fit that description was Warren Christopher, who left office in January 1997, when Albright ended the centuries-old tradition.