Ecuadorian–Peruvian War
Following the Ecuadorian–Peruvian War of 1941, the Rio Protocol sought to formalize the boundary between those two countries. Ongoing boundary disagreements led to a brief war in early 1981 and the Cenepa War in early 1995, but in 1998, the governments of both countries signed an historic peace treaty that clearly demarcated the international boundary between them. In late 1999, the governments of Peru and Chile implemented the last outstanding article of their 1929 border agreement.