Anglo-French blockade of the Río de la Plata
The Anglo-French blockade of the Río de la Plata, also known as Paraná War, was a five-year naval blockade imposed by France and the United Kingdom on the Argentine Confederation during the Uruguayan Civil War. It was imposed by the Royal Navy and French Navy in 1845 against the Río de la Plata Basin to support the Colorado Party in Uruguay's civil war, resulting in the closure of Buenos Aires to maritime commerce. The Argentine government, led by Juan Manuel de Rosas, refused to drop their support for the Uruguyan White Party, which supported Argentina's resistance to the blockade. Eventually, both Britain and France ended the blockade, signing the Arana-Southern Treaty in 1849 and 1850 respectively, which acknowledged Argentine sovereignty over its rivers.
