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Events on Wednesday 27 August 1828 1
1828Preliminary Convention of Peace creates UruguayArgentina and Brazil agree to an independent buffer stateArgentina and Brazil signed the Preliminary Convention of Peace in Rio de Janeiro, ending the Cisplatine War over the Banda Oriental. Both sides agreed to recognize the territory as an independent state rather than let either power annex it. This agreement laid the groundwork for the Republic of Uruguay, formally constituted the following year.