During 1873, Juan and Clara Lawrence, the first Argentine citizens to visit Ushuaia, arrived to teach school. That same year Julio Argentino Roca, who later served as Argentine President twice, promoted the establishment of a penal colony for re-offenders, modeled after one in Tasmania, Australia, in an effort to secure permanent residents from Argentina and to help establish Argentine sovereignty over all of Tierra del Fuego. But only after the Boundary treaty of 1881 between Chile and Argentina did formal efforts get under way to establish the township and its prison.