Viceroy Cisneros tried to maintain the political status quo , but a group of criollo lawyers and military officials organized Arranging an open cabildo ( a special meeting of notables of the city ) on May 22 to decide Deciding the future of the Viceroyalty .

The newly formed Coming_to_be government , the Primera Junta , included Cause_to_be_included only representatives from Buenos Aires and invited Request other cities of the Viceroyalty to send Sending delegates to join Becoming_a_member them .

Under the Spanish Empire , Colombia and Ecuador had been part of the Viceroyalty of New Granada , and upon independence from Spain , they had co-existed Presence as part of Greater Colombia between 1819 and 1831 .

Rosas backed the Uruguayan Blanco party in this conflict , and further desired to extend Expansion Argentine borders to areas formerly occupied Control by the Spanish Viceroyalty of the Río de la Plata .

This threatened Warning Brazilian interests and sovereignty since the old Spanish Viceroyalty had also included Cause_to_be_included territories which had long been incorporated Cause_to_amalgamate into the Brazilian province of Rio Grande do Sul .