Even though the city did not have a clear foundation date or any official acknowledgement thereof, most commentators state that Rosario was founded on 7 October 1793 with a local population of 457 inhabitants.
Nonetheless the town was officially declared as city on 3 August 1852, at the time it was known as Pago de los Arroyos, that is, "land of the streams", a reference to the several small rivers that traverse the southern region of Santa Fe, like the Ludueña Stream, the Saladillo Stream and others, emptying into the Paraná River.
) is the largest city in the province of Santa Fe, in central Argentina.
It is located 300 km (186 mi) northwest of Buenos Aires, on the western shore of the Paraná River.
Romero de Pineda established the first permanent settlement, an estancia — intended as farmland, not as a town.
In 1719 the Jesuits bought another part and established Estancia San Miguel.
The area was still so scarcely populated that it had no central authority; it was ruled from the provincial capital (Santa Fe), and in turn from Buenos Aires.
The Rosario-Victoria Bridge, opened in 2004, spans the Paraná River, connecting Rosario with the city of Victoria, across the Paraná Delta.
Because it plays a critical role in agricultural commerce, the city finds itself at the center of a continuing debate over taxes levied on big-ticket agricultural goods such as soy.