Today, foreigners travel to the Yucatan for ruins, temples, and pyramids, white sand beaches and clear blue water. One hundred years ago, they went for cheap labor, an abundance of land, and the opportunity to make a fortune exporting cattle, henequen fiber, sugarcane, or rum. Sometimes they found death. In 1875 an American plantation manager named Robert Stephens and a number of his workers were murdered by a band of Maya rebels. To this day, no...