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.
Emperor of Mexico
With the Declaration of Independence of the Mexican Empire from Spain in 1821, Mexico became an independent monarchy—the First Mexican Empire (1822–1823). Mexico briefly reverted into a monarchy in the 1860s, during the Second Mexican Empire (1864–1867). In both instances of Empire, the reigning Emperor was forcibly deposed and then executed.