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"Província Cisplatina" as part of Brazil.

In 1821, the Provincia Oriental del Río de la Plata (present-day Uruguay), was annexed by Brazil under the name of Província Cisplatina. In response, the Thirty-Three Orientals led by Juan Antonio Lavalleja declared independence on August 25, 1825 supported by the United Provinces of the Río de la Plata, present-day Argentina.

This led to the 500-day Argentina-Brazil War. Neither side gained the upper hand, and in 1828 the Treaty of Montevideo, fostered by the United Kingdom, gave birth to Uruguay as an independent state.

Source: Wikipedia.

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