Irishman Hugo O'Conor, who worked for the Spanish crown, established the Tucson presidio (fort) in August 1775. It later changed hands when Mexico won independence from Spain. Then, in 1853, Tucson became a part of the United States with the Gadsden Purchase. Today visitors can see parts of the original wall and a recreated corner of the fort at Presidio San AgustÃn del Tucson on the northwest corner of Court Avenue and Washington Street. Old Town Artisans spans a historic block and features local, regional, and Latin American artists as well as a Southwestern restaurant. El Charro Café, purportedly the oldest Mexican food restaurant in the country, resides nearby.