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.
Guerrero
Peoples of the territory of Guerrero immediately supported the cause of Miguel Hidalgo y Costilla which would culminate with the Independence of Mexico. During the first part of the Mexican War of Independence, José María Morelos fought on the side of Miguel Hidalgo in the southern part of Mexico, including the Acapulco area and the Costa Grande. However, the insurgents were never able to take the port. They were able to take control of territories in the center of the state. Morelos took Chilpancingo and set up the Congress of Anáhuac, which would publish the document "Sentimentos de la Nación" on 6 November 1813. The Congress of Anáhuac also approved the Act of Independence written by Carlos María Bustamante. Later, the Mexican flag was designed and first sewn in Iguala, after Agustín de Iturbide and Vicente Guerrero joined forces under the Plan of Iguala to end the war in 1821.