The 1853 constitution was elaborated immediately after the Battle of Caseros, which saw the defeat of Rosas, who held political control in Buenos Aires for two decades. The shift in the political landscape left Justo José de Urquiza in charge of the national business. On April 6, 1852, Urquiza had a meeting with governors Vicente López y Planes of Buenos Aires, Juan Pujol of Corrientes, and delegates of Santa Fe, where it was decided to call for a Constitutional Congress under the terms of the Federal Pact of 1831. The decision of opening the congress in August of the following year was communicated to the rest of the provinces.