Mexican War of Independence
The Mexican War of Independence () was an armed conflict, and the culmination of a political and social process which ended the rule of Spain in 1821 in the territory of New Spain. The war had its antecedent in Napoleon's French invasion of Spain in 1808; it extended from the Cry of Dolores by Father Miguel Hidalgo y Costilla on September 16, 1810, to the entrance of the Army of the Three Guarantees led by Agustín de Iturbide to Mexico City on September 27, 1821. September 16 is celebrated as Mexican Independence Day.
History of Monterrey
After the country's independence from the Spanish Crown and the foundation of Mexico in 1821, the governments of Mexico and the United States fought the Mexican-American War, which resulted in the loss of more than half of Mexico's national territory. On 23 September 1846 General William J. Worth besieged the city and a battle between the two countries was fought from Cerro del Obispado to the Villa de Guadalupe, known as the Battle of Monterrey. American troops remained in the Mexican territory until 1848 and the Mexico-American War ended with the treaty of Guadalupe Hidalgo in which the conflicting parties agreed that the United States would acquire the territories of Alta California and New Mexico, and the territory between the Nueces River and the Rio Grande, claimed by the Republic of Texas.