For local officials and some historians, Mexcaltitan is nothing less than the mythical Aztlan, birthplace of the ancient Aztecs. According to legend, the Aztecs left an island in 1091 and wandered for two centuries before settling in what is now Mexico City. There, they founded the legendary city of Tenochtitlan, an island city of canals and floating gardens, and lorded over an empire that stretched from Guatemala to northern Mexico before the Spanish conquered them in 1521... In Mexcaltitan, located in the Pacific state of Nayarit, clues that this was once Aztlan are tantalizing. In Nahuatl, the language of the...