There is a country that began as a province of an empire it never wanted to join. Between 1821 and 1828, the territory we now call Uruguay was Cisplatina - a Brazilian province carved out by invasion, its very name a Latin boast meaning 'on this side of the Plata,' as if the land belonged naturally to Brazil. It did not. The seven-year life of Cisplatina is the strange middle chapter of how a small nation was born by being fought over, annexed, and finally let go.
The Banda Oriental - the strip east of the Uruguay River - had always been borderland, a thinly settled buffer where Spanish and Portuguese empires ground against each other for generations. In 1811 a rancher named José Gervasio Artigas, who would become Uruguay's national hero, rose against Spain and won at the Battle of Las Piedras. He built a Federal League and was named its Protector, and his growing power and stubborn republicanism alarmed the Portuguese monarchy to the north. In 1816 they invaded. By January 1817 they held Montevideo, and after three years of fighting in the countryside they finally broke the pro-Artigas forces at the Battle of Tacuarembó.
In 1821 the conquerors made the annexation official. The Provincia Oriental was folded into the Kingdom of Brazil under the name Cisplatina, the act justified by the 'general acclamation' of an assembly of hand-picked Oriental notables. When Brazil declared independence from Portugal in 1822, the new Empire of Brazil simply kept the province. Argentina objected - its envoy argued in Rio de Janeiro that the Banda Oriental had always belonged to the River Plate provinces - and received a flat imperial refusal. Brazil, the answer ran, had made sacrifices for this territory and would defend it; the matter was closed. It was not closed.
In August 1825 a small band of insurgents, the Thirty-Three Orientals under Juan Antonio Lavalleja, declared independence and won the backing of the United Provinces of the River Plate, which hoped to absorb the region themselves. The result was the Cisplatine War, fought between Brazil and Argentina over the contested ground. Neither side could win it outright. The largest land battle, at Ituzaingó in February 1827, went to the Argentine army, yet the war stayed deadlocked - two empires bleeding over a province that wanted to belong to neither.
The deadlock was broken not on a battlefield but at a negotiating table, and the hand that guided it was British. London wanted free trade on the Río de la Plata and feared what a Brazilian-Argentine war could do to it, so the diplomat John Ponsonby pushed both sides toward a settlement. On 27 August 1828 the Preliminary Peace Convention was signed, and Cisplatina ceased to exist. In its place stood the Oriental Republic of Uruguay - independent at last, but independent largely because two larger powers and a third, distant one all decided a buffer state between them served everyone's interests. A nation that began as a contested borderland ended as a deliberate one.
Cisplatina was a province, not a point - it covered roughly the whole of present-day Uruguay, bounded by the Atlantic on the east, the Río de la Plata on the south, the Uruguay River on the west, and the Quaraí River on the north. Its symbolic center sits near 33.00°S, 56.00°W in the Uruguayan interior, classic rolling grassland and cuchilla ridges. The principal gateway is Carrasco International Airport (ICAO: SUMU) at Montevideo on the southern coast, the historic capital the empire fought to hold; interior fields lie at Durazno, Melo, and Treinta y Tres. From the air the old province reveals itself as a coherent landscape - the wide brown mouth of the Plata, the Uruguay River's western edge, and endless pasture between, the natural borders that helped define a buffer nation. Best viewed in clear daylight. Recommended viewing altitude FL250-FL370 for the regional sweep, lower over Montevideo and the coast.