The Six Years' War (Spanish: Guerra de los seis años; 1868–74) was a civil war in the Dominican Republic that "constituted the third war of independence fought by the Dominican people", in this case against the administration of President Buenaventura Báez, which in 1869 negotiated the Dominican Republic's annexation to the United States. According to the Dominican intellectual Pedro Henríquez Ureña, this war was a critical phase in the creation of Dominican national consciousness because, having already differentiated themselves from the Haitians in the first war of independence and the Spaniards in the second, the Dominicans asserted their incompatibility with the United States.