Question: What secessionist republic resulting from the overthrow of the Argentine Confederation government signed The Pact of San José de Flores?
Sentence (from "Pact of San José de Flores"): The Pact of San José de Flores ("Pacto Unión San José de Flores", or "Pacto de Unión Nacional") was a treaty signed between the Argentine Confederation and the State of Buenos Aires on November 11, 1859, on the aftermath of the Battle of Cepeda.
Relevant evidence: Yes