The Preliminary Peace Convention was a bilateral treaty signed on 27 August 1828 between the Empire of Brazil and the United Provinces of the Río de la Plata, after British mediation, that put an end to the Cisplatine War and recognized the independence of Uruguay.
Called the Preliminary Peace Convention as a result of the meetings held by representatives from the Empire of Brazil and the United Provinces — the predecessor state for Argentina — between 11 and 27 August 1828 in Rio de Janeiro, Brazil. This convention, or treaty, accorded independence to Uruguay in respect to Brazil and Argentina. Uruguay's independence would be definitively sealed on 4 October of the same year when, in Montevideo, the signing nations ratified the treaty.
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