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Flags for a Southern Cone Union (Union between Argentina, Chile and Uruguay) : r/vexillology

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Map of the United Provinces of Rio de la Plata (A New World Wreathed in Freedom) : r/mapmaking

South Cone Union, Earthmc Wiki

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Flag of the South Cone Confederacy, otherwise known as the Magellan Republic (1817-1849) : r/vexillology