After the Argentine-Brazilian war, which brought the independence of the Banda Oriental del Uruguay, the political situation in the provinces was greatly effected by the disappearance of Rivadavia's Unitarian national government. Due to this the provinces proclaimed their autonomy and gave the governor of Buenos Aires, Manuel Dorrego, the responsibility to manage Argentina's foreign relations. Many attempts were made to reorganize the national government under the ideals of the Federalist Party, but they all failed, as a result, the Unitarian party attempted to retake control.