On this day (28 September) in 1821, Juan José Espinosa de los Monteros, secretary of Mexico’s newly-created “Provisional Governmental Board” (the first governing body of independent Mexico that administered the country from 28 September 1821 until 24 February 1822), drafts the Acta de Independencia del Imperio Mexicano (Declaration of Independence of the Mexican Empire; pictured below), the founding document by which Mexico declared independence from the Spanish Empire.