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.
Military history of Mexico
The military history of Mexico consists of several millennia of armed conflicts within what is now that nation's territory and includes activities of the Mexican military in peacekeeping and combat related affairs worldwide. Wars between prehispanic peoples marked the beginning of Mexico's military history, the most notable of these fought in the form of a "flower war". After the Spanish conquest of Mexico in the 16th century, indigenous tribes were defeated by Spain, thus beginning a three century era of Spanish dominance. Mexico's struggle for independence began primarily in the 19th century, and was marked by internal conflict of early rulers after defeating the Spanish in 1821. The Mexican–American War in the mid 19th century ended in the defeat of Mexican forces, and the loss of two-fifths of the national territory. In the remainder of the 19th century, a series of conflicts began in Mexico, as the War of the Reform and the defeat of the French during their intervention in Mexico marked events in that era.