Spanish attempts to reconquer Mexico
Mexican independence was officially achieved on September 27, 1821, under the Treaty of Córdoba. Spain did not recognize the treaties, arguing that the viceroy Juan O'Donojú had no authority to recognize the independence of any overseas province. This situation was dangerous to the newly acquired independent status of the nation, which had not yet been recognized by any of the European powers that could support it, and the threat of Spanish reconquest was a constant worry to the leaders of the nascent regime. On May 13, 1822 decrees were issued by the government to imprison anyone who conspired against Mexico's independence.
Convention of 1833
Mexico won its independence from Spain in 1821. After the new country's monarchy was overthrown, the Constitution of 1824 established a federalist republic composed of multiple states. Sparsely populated provinces were denied independent statehood and instead merged with neighboring areas. Mexican Texas, which marked the country's eastern border with the United States, was combined with Coahuila to form the new state Coahuila y Tejas. To facilitate government of the large area, the state was subdivided into several departments; all of Texas was included in the Department of Béxar.