Argentina-Uruguay relations
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Argentina–Uruguay relations are foreign relations between the Argentine Republic and the Eastern Republic of Uruguay. Both countries were part of the Spanish Empire until the early 19th century.
Initially, both modern states of Argentina and Uruguay were part of the Viceroyalty of the Río de la Plata. Buenos Aires was by then the Capital city, and the Banda Oriental a province of it. During this period, both Buenos Aires and Montevideo faced two British invasions of the Río de la Plata. In the first one, the British successfully invaded Buenos Aires, being defeated later by a Montevidean army led by Santiago de Liniers. The British invaded Montevideo the second time, but failed to invade Buenos Aires, and Buenos Aires demanded the liberation of Montevideo in the British capitulation.
The Spanish king Ferdinand VII was captured during the Peninsular War, and replaced by the French Joseph Bonaparte. He was not recognized as a legitimate king, which left the Spanish monarchy without a ruler. This generated political reactions all across the Spanish Empire. Despite being of French ancestry, Liniers rejected Joseph's rule and confirmed his allegiance to the captive king, but Javier de Elío did not trust him, and created a government Junta in Montevideo. Martín de Álzaga, Elío's ally in Buenos Aires, attempted to do the same by organizing a mutiny, but failed. Elío gave up his junta when Liniers was replaced by a new viceroy, Baltasar Hidalgo de Cisneros. However, as the Spanish situation in the Peninsular War worsened, Buenos Aires deposed Cisneros during the May Revolution and create their own junta. This started the Argentine War of Independence. Montevideo was declared then the new capital of the viceroyalty, and became a Royalist stronghold. The other populations of the Banda Oriental, however, did not join Montevideo. Led by José Gervasio Artigas, they made the cry of Asencio and laid siege to the city until its defeat.
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