On the death of Dorrego, a remarkable man, Juan Manuel de Rosas, became the Federalist chief.
Rosas gradually concentrated all power in his own hands, and was hailed by the populace as a saviour of the state.
This dictatorship of Rosas continued until 1852.
Buenos Aires was in 1838 blockaded by a French fleet; but Rosas stood firm.
The rule of Rosas was now one of tyranny and almost incessant bloodshed in Buenos Aires, while his partisans, foremost amongst whom was General Ignacio Oribe, endeavoured to exterminate the Unitarians throughout the provinces.
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