The Boundary Treaty of 1881 (Spanish: Tratado de Límites de 1881) between Argentina and Chile was signed on 23 July 1881 in Buenos Aires by Bernardo de Irigoyen, for Argentina, and Francisco de Borja Echeverría, for Chile, with the aim of establishing a precise border between the two countries based on the uti possidetis juris principle. Despite dividing largely unexplored lands, the treaty laid the groundwork for nearly all of Chile's and Argentina's 5600 km current border.
Y Wladfa (Welsh pronunciation: [ə ˈwladva], 'The Colony'), also occasionally Y Wladychfa Gymreig (Welsh pronunciation: [ə wlaˈdəχva ɡəmˈreiɡ], 'The Welsh Settlement'), refers to the establishment of settlements by Welsh colonists and immigrants in the Argentine Patagonia, beginning in 1865, mainly along the coast of the lower Chubut Valley. In 1881, the area became part of the Chubut National Territory of Argentina which, in 1955, became Chubut Province.
In the 19th and early 20th centuries, the Argentine government encouraged emigration from Europe to populate Argentina and south Patagonia particularly, which until the Conquest of the Desert had sparsely rural and coastal settlements. Between 1856 and 1875, 34 settlements of immigrants of various nationalities were established in Santa Fe and Entre Ríos. In addition to the main colony in Chubut, a smaller colony was set up in Santa Fe by 44 Welsh people who left Chubut, and another group settled at Coronel Suárez in southern Buenos Aires Province.