Mexican War of Independence
Although Mexico gained its independence in September 1821, the marking of this historical event did not take hold immediately. The choice of date to celebrate was problematic, because Iturbide, who achieved independence from Spain, was rapidly created Emperor of Mexico. His short-lived reign from 1821–22 ended when he was forced by the military to abdicate. This was a rocky start for the new nation, which made celebrating independence on the anniversary of Iturbide's Army of the Three Guarantees marching into Mexico City in triumph a less than perfect day for those who had opposed him. Celebrations of independence during his reign were marked on September 27. Following his ouster, there were calls to commemorate Mexican independence along the lines that the United States celebrated in grand style its Independence Day on July 4. The creation of a committee of powerful men to mark independence celebrations, the "Junta Patriótica", organized celebrations of both September 16, to commemorate Hidalgo's grito and the start of the independence insurgency, and September 27, to celebrate actual political independence.
Miguel Ramos Arizpe
The insurgency for Mexican independence that began with Father Miguel Hidalgo's 1810 uprising and carried on by Father José María Morelos, and Vicente Guerrero during the 1810s was at a military stalemate with royalist forces. With the 1820 Spanish Constitution, the power of the Roman Catholic Church in Mexico was threatened. Royalist military officer Agustín de Iturbide made an alliance with Guerrero, and under the Plan de Iguala declaring Mexico's independence, which was achieved in 1821. The formation of the new Mexican state initially involved a constituent congress, but Iturbide seized power and declared himself Agustín I, emperor of Mexico. Ramos Arizpe returned to Mexico in 1822, when opposition to Iturbide was coalescing. He was "instrumental in mobilizing the provinces and drafting the Plan of Casa Mata," which called for the overthrow of Iturbide.