Riograndense Republic
The Riograndense Republic, often called the Piratini Republic, was a de facto state that seceded from the Empire of Brazil and roughly coincided with the present state of Rio Grande do Sul. It was proclaimed on 11 September 1836 by general Antônio de Sousa Neto as a direct consequence of the victory obtained by gaúcho oligarchic forces at the Battle of Seival (1836) during the Ragamuffin War (1835–1845). It had a constitution adopted in 1843 and was recognised only by the United Kingdom, France, and Uruguay.