In 1816, the United Provinces of the Rio Plata declared their independence from Spain. After Bolivia, Paraguay, and Uruguay went their separate ways, the area that remained became Argentina. The country's population and culture were heavily shaped by immigrants from throughout Europe, but most particularly Italy and Spain, which provided the largest percentage of newcomers from 1860 to 1930. Up until about the mid-20th century, much of Argentina's history was dominated by periods of internal political conflict between Federalists and Unitarians and between civilian and military factions. After World War II, an era of Peronist authoritarian rule and interference in subsequent governments was followed by a military junta that took power in 1976. Democracy returned in 1983, and has persisted despite numerous challenges, the most formidable of which was a severe economic crisis in 2001-02 that led to violent public protests and the resignation of several interim presidents. The economy has recovered strongly since bottoming out in 2002.

The first Spanish conquistadors discovered the Río de la Plata , and they named the estuary Mar Dulce ('Sweet Sea', as in a fresh water sea). Indigenous people gave gifts of silver to the survivors of the shipwrecked expedition, who were led by Juan Díaz de Solís . The legend of Sierra del Plata – a mountain rich in silver – reached Spain around 1524, and the name was first seen in print on a Venice map from 1536. The source of the silver was the area where the city of Potosí was to be founded in 1546. An expedition that followed the trail of the silver up the Paraná and Pilcomayo rivers finally reached the source only to find it already owned by excavaters who reached it from Lima , the capital of the Viceroyalty of Peru .