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In page History of Uruguay:

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This war ended on 27 August 1828 when Treaty of Montevideo was signed. After mediation by Viscount Ponsonby, a British diplomat, Brazil and Argentina agreed to recognize an independent Uruguay as a buffer state between them. As with Paraguay, however, Uruguayan independence was not completely guaranteed, and only the Paraguayan War secured Uruguayan independence from the territorial ambitions of its larger neighbors.[citation needed] The Constitution of 1830 was approved in September 1829 and adopted on 18 July 1830.[4]