In early 2005, after I’d finished an assignment for the New York Times in northern Thailand, I took a weekend trip to Myanmar. Myanmar, or Burma, as it’s also known, was under exceedingly tight military rule back then, but Americans could, for reasons I didn’t try to understand, cross the border without a prearranged visa, provided they stayed less than fourteen days and did not travel beyond eastern Shan State. Since I had just a couple of days free, and wanted only to see the unusual and fascinating hill tribes of the Golden Triangle, the famously lawless opium-and-gun-smuggling region, these were hardly onerous restrictions.