Haiti, the former French colony of Saint-Domingue on Hispaniola, was the first Caribbean nation to gain independence from European powers in 1804. This followed 13 years of war that started as a slave uprising in 1791 and quickly turned into the Haitian Revolution under the leadership of Toussaint l'Ouverture, where the former slaves defeated the French army (twice), the Spanish army, and the British army, before becoming the world's first and oldest black republic, and also the second-oldest republic in the Western Hemisphere after the United States. This is additionally notable as being the only successful slave uprising in history. The remaining two-thirds of Hispaniola were conquered by Haitian forces in 1821. In 1844, the newly formed Dominican Republic declared its independence from Haiti.