SALAMANCA, N.Y. – In a valley that curves along the Allegheny River is a tract of land built on opportunity, greed, and the bureaucratic nightmare of being one city in two nations. According to state and local authorities, Salamanca is the only U.S. city located on an Indian reservation. Toward the end of the 19th century, it was a flourishing railroad town of laborers, families and industrious entrepreneurs, all striving for the American dream. It was named for a Spanish aristocrat who was convinced by Erie Railroad speculators (with an introduction from an American president) to invest in a rail...