== errors/ommissions == 

 There are several errors and omissions in this page. Of course I could just change it, but the maps also have to be changed: 
 * Yucatán was independent twice (1841-1843 and 1846-1848) 
 * Campeche became a territory in 1857 (Campeche y Carmen) and was granted statehood a year later. 
 * A part of Guerrero (the area around Altamirano) was part of Michoacán before 1907 
 * The isthmus of Tehuantepec was a separate territory from 1853 to 1857 
 * The southwestern part of Campeche (Carmen) was part of Tabasco until 1854. From 1854 to 1857 it was a territory and in 1857 it was added to Campeche. 
 * The Sierra Gorda, the northeastern portion of Querétaro was also a territory from 1854 to 1857. 
 * Zacatecas declared itself independent in 1835, though it was rapidly defeated. 
 * The Federal District has changed its shape and size several times. It started as a perfect circle, was annex to Edomex in 1837, recreated in 1846, enlarged in 1853 and got its final shape in 1902. 
 * In the constitution of 1857 there were several minor border changes. Michoacán gained parts of Guanajuato, Zacatecas of Jalisco and SLP and Tabasco of Veracruz. 
 * The Revillagigedo Archipelago was awarded to Colima in 1861 (I presume it was inuncorporated before that date). 
 * Initially Puebla reached to the Gulf of Mexico, dividing Veracruz in two, this was changed in 1853. 
 * Initially border between Chihuahua and Durango was a straight line. I don't know when these things were changed though. 
 * From 1913-1915 and 1931-1935 Quintana Roo was reincorporated into Yucatán. 
 * From 1835-1845 and 1853-1855 there was a centralist system, the states and territories were replaced by departements. This should someway be included.