Mexican War of Independence
The Mexican War of Independence () was an armed conflict, and the culmination of a political and social process which ended the rule of Spain in 1821 in the territory of New Spain. The war had its antecedent in Napoleon's French invasion of Spain in 1808; it extended from the Cry of Dolores by Father Miguel Hidalgo y Costilla on September 16, 1810, to the entrance of the Army of the Three Guarantees led by Agustín de Iturbide to Mexico City on September 27, 1821. September 16 is celebrated as Mexican Independence Day.
Spanish Empire
A long period of wars followed in America from 1811 to 1829. In South America this period of wars led to the independence of Argentina (1810), Venezuela (1810), Chile (1810), Paraguay (1811) and Uruguay (1815, but subsequently ruled by Brazil until 1828). José de San Martín campaigned for independence in Chile (1818) and in Peru (1821). Further north, Simón Bolívar led forces that won independence between 1811 and 1826 for the area that became Venezuela, Colombia, Ecuador, Perú and Bolivia (then Alto Perú). In the Viceroyalty of New Spain, free-thinking secular priest, Miguel Hidalgo y Costilla, declared Mexican freedom in 1810 in the Grito de Dolores. Independence was actually won in 1821 by a royalist army officer turned insurgent, Agustín de Iturbide, in alliance with insurgent Vicente Guerrero and under the Plan of Iguala. The conservative Catholic hierarchy in New Spain supported Mexican independence largely because it found the liberal Spanish Constitution of 1812 abhorrent.