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 Yucat n 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 Michoac n 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 Quer taro 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 Michoac n 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 Yucat n From 1835 1845 and 1853 1855 there was a centralist system the states and territories were replaced by departements This should someway be included