High Quality Content by WIKIPEDIA articles! The territorial dispute between Ecuador and Peru was the source of the longest-running international armed conflict in the Western Hemisphere. This dispute was a consequence of the imprecise geographical definitions used in colonial times to define the limits of the Royal Audiences; after Peru and neighboring Gran Colombia proclaimed independence from the Spanish crown in 1821 and 1819, respectively, this dispute led to the war of 1828. In the aftermath, the belligerent parties agree to proclaim their limits in the basis of the principle "Utis Posedetis" and the border became the one that existed between the Spanish viceroyalties of Peru and New Granada.