Nevertheless, the Protocol was incomplete, and war broke out between Peru and Ecuador twice more, in 1981 and in 1995, before the signing of the Itamaraty Peace Declaration which brought final resolution to the dispute.

In May 1941, as tensions at the Ecuadorian-Peruvian border mounted and war was imminent, the governments of the United States, Brazil, and Argentina offered their services in aiding in the mediation of the dispute.

Despite this, limited skirmishes continued to occur through the months of August and September in the Ecuadorian provinces of El Oro and Loja, as well as in the Amazonian lands.

[citation needed] At the third Pan-American Summit, held in Rio de Janeiro, Brazil, the United States encouraged a settlement between the two countries.

An area of 200,000 km2 (77,000 sq mi) of hitherto disputed territory in the Maynas region of the Amazonian basin was awarded to Peru, which had been established to be the de facto possessor of the land since the end of the 19th century.