The Argentine War of Independence, which began in 1810, was soon followed by the Argentine Civil Wars, as the provinces had conflictive views over the national organization. The federals supported the autonomy of the provinces, and the Unitarian party supported a political centralization of the country in Buenos Aires. The Argentine Constitution of 1819, drafted by the Congress of Tucumán, was highly centralist. It was abolished in 1820 after the federal victory at the battle of Cepeda. The office of the Supreme Director of the United Provinces of the Río de la Plata, the head of state at the time, was abolished as well. The provinces stayed united as a country by the Treaty of Pilar, but without any constitution or head of state for the time being. This period is known as the "anarchy of the year XX".