After the signing of the Salomón-Lozano Treaty in 1922, Colombia and Peru officially established their borders and exchanged strategic territories: Colombia obtained an entrance to the Amazon River through the Amazon Trapeze, while Peru de jure obtained a strategic exclave between the Putumayo and San Miguel rivers.

In 1933, after the failure of the only serious attempt to colonize the triangle, taking advantage of the end of the Colombian-Peruvian war and in the lapse of the signing of the 1934 protocol, the Peruvian diplomats Víctor Manuel Maúrtua, Víctor Andrés Belaúnde, Alberto Ulloa Sotomayor and Raúl Porras Barrenechea tried to reach an agreement with their Colombian counterparts, so that the Sucumbíos triangle would return to Colombian sovereignty and the Amazon trapeze to Peruvian sovereignty, this did not happen, however, and Peru continued to possess the uncontrolled territory.

During the conflict Ecuador maintained control of the Sucumbíos triangle, as well as the territories on its side of the de facto border of 1936.

During the negotiations after the war for the Rio de Janeiro Protocol, Peru granted the triangle to Ecuador, in addition to other territorial claims in the upper Napo River, in exchange for other territories, as well as recognition of Peruvian sovereignty in Tumbes, Jaén and Maynas.

[1][7] The oil-rich region proved extremely beneficial to Ecuador in the long run, as it contributed to its economy and a national reconstruction program started after the war[citation needed].