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.
Republic of Texas
Along with the rest of Mexico, Texas gained its independence from Spain in 1821 following the Treaty of Córdoba, and the new Mexican state was organized under the Plan of Iguala, which created Mexico as a constitutional monarchy under its first Emperor Agustín de Iturbide. During the transition from a Spanish territory to part of the independent country of Mexico, Stephen F. Austin led a group of American settlers known as the Old Three Hundred, who negotiated the right to settle in Texas with the Spanish Royal governor of the territory. Since Mexican independence had been ratified by Spain shortly thereafter, Austin would later travel to Mexico City to secure the support of the new country for his right to settle. The establishment of Mexican Texas coincided with the Austin-led settlement, leading to animosity between Mexican authorities and ongoing American settlement of Texas. The First Mexican Empire was short lived, being replaced by a republican form of government in 1823. Following Austin's lead, additional groups of settlers, known as Empresarios, continued to colonize Mexican Texas from the United States. In 1830, Mexican President Anastasio Bustamante outlawed American immigration to Texas, following several conflicts with the Empresarios over the status of slavery in the region. Angered at the interference of the Mexican government, the Empresarios held the Convention of 1832, which is considered the first formal step in what would later become the Texas Revolution.