Former Ecuadorian President Velasco Ibarra in August, 1960, declared the nullity of his nation’s internationally guaranteed 1942 settlement with Peru. His Foreign Ministry then published a justification. The arguments are familiar—that the Rio protocol was imposed upon Ecuador by the great American powers in the interest of hemispheric unity during World War II; that at the time Peru, through military aggression, occupied her southern provinces; that therefore free Ecuadorian consent to the agreement was lacking; and finally, that the pact contained an error of frontier definition which made its execution impossible. Given these facts, and the condemnation of aggression by American international law, the 1942 protocol is without legality and, therefore, void. This document is a significant statement of the plaintiff’s position in the most serious remaining American frontier question.