Mexican War of Independence
Iturbide's assignment to the Oaxaca expedition coincided with a successful military coup in Spain against the monarchy of Ferdinand VII. The coup leaders, part of an expeditionary force assembled to suppress the independence movements in the Americas, had turned against the monarchy. They compelled the reluctant Ferdinand to reinstate the liberal Spanish Constitution of 1812 that created a constitutional monarchy. When news of the liberal charter reached Mexico, Iturbide perceived it both as a threat to the status quo and a catalyst to rouse the criollos to gain control of Mexico. Independence was achieved when conservative Royalist forces in the colonies chose to rise up against the liberal regime in Spain; it was an about-face compared to their previous opposition to the peasant insurgency. After an initial clash with Guerrero's forces, Iturbide assumed command of the royal army. At Iguala, he allied his formerly royalist force with Guerrero’s radical insurgents to discuss the renewed struggle for independence.
Celebration of Mexican political anniversaries in 2010
The two dates represent the beginning of the Mexican War of Independence and Mexican Revolution respectively. The anniversary of the War of Independence is called "El Grito" (The Shout or The Cry) and takes place at 11 pm on 15 September, with the following day 16 September officially marking Mexico's Independence. El Grito is a re-enactment of the call made by Miguel Hidalgo y Costilla in Dolores Hidalgo, Guanajuato at around 6 am on 16 September 1810 to his parish to take up arms against the Spanish colonial government. Each year, this re-enactment occurs not only on the main square (Zócalo) of the capital, Mexico City, but also on every main plaza in almost all communities in the country.