The Argentine " mesopotamia," between the Parana and Uruguay rivers, belongs in great measure to this same region, being partly wooded, flat and swampy in the north (Corrientes), but higher and undulating in the south (Entre Rios).
The principal wheat and Indian corn producing districts lie in the provinces of Santa Fe, Buenos Aires, Cordoba and Entre Rios, and the average yield of wheat throughout the country is about 12 bushels to the acre.
In 1620 Buenos Aires was separated from the authority of the government established at Asuncion, and was made the seat of a government extending over Mendoza, Santa Fe, Entre Rios and Corrientes, but at the same time remained like the government of Paraguay at Asuncion, and that of the province of Tucuman, which had Cordoba as its capital, subject to the authority of the viceroyalty of Peru.
In 1840 he invaded Buenos Aires at the head of troops raised chiefly in the province of Entre Rios; but he was defeated at Santa Fe, then at Lujan, and finally was captured in Jujuy and shot, 1841.
The downfall of Rosas was at last brought about by the instrumentality of Justo Jose de Urquiza, who as governor of Entre Rios, had for many years been one of his strongest supporters.