The Treaty of Peace, Friendship, Commerce and Navigation of 1856 between Chile and Argentina (Spanish: Tratado de paz, amistad, comercio y navegación entre la República de Chile y la Confederación Argentina) was the first boundary treaty between Argentina and Chile. It established that the boundaries should be based on the uti possidetis principle based on what each country possessed before independence in 1810. It also postponed the solution of disputes into the future. Article no 39 of the treaty proposed the use of direct diplomatic negotiations and arbitration to resolve disputes. This treaty was later declared null and void in the Boundary treaty of 1881 between Chile and Argentina, but the principle of uti possidetis and the mechanism for solving disputes where inherited by the 1881 treaty.

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Tratado de paz, amistad, comercio y navegación entre la República de Chile y la Confederación Argentina Wikisource