Sorry. Cinco de Mayo is a celebration of the Mexico's independence from France. Although in Mexico, the 16th of September is a bigger holiday (that's when they celebrate their independence from Spain), we celebrate on May 5 by drinking Mexican beer (Corona, Tecate, etc.) and, of course, margaritas!
Basically, it's an excuse to drink!
Originally posted by piderman"...The catalyst for rebellion came in 1808 when Napoleon Bonaparte occupied most of Spain - direct Spanish control over New Spain suddenly ceased and rivalry between Spanish-born colonists and criollos intensified. On September 16, 1810, Miguel Hidalgo y Costilla, a criollo parish priest, issued his call to rebellion, the Grito de Dolores. In 1821 Spain agreed to Mexican independence.
I'm a bit lost on the two independencies. Maybe a little update on the history of Mexico?
Twenty-two years of chronic instability followed independence: the presidency changed hands 36 times. In 1845, the US congress voted to annex Texas, leading to the Mexican-American War in which US troops captured Mexico City. Under the Treaty of Guadalupe Hidalgo (1848), Mexico ceded Texas, California, Utah, Colorado and most of New Mexico and Arizona to the USA. The Maya rose up against their overlords in the late 1840s and almost succeeded in driving them off the Yucatán Peninsula. By 1862, Mexico was heavily in debt to Britain, France and Spain, who sent a joint force to Mexico to collect their debts. France decided to go one step further and colonize Mexico, sparking yet another war. In 1864, France invited the Austrian archduke, Maximilian of Hapsburg, to become emperor of Mexico. His reign was bloodily ended by forces loyal to the country's former president, Benito Juárez, a Zapotec from Oaxaca..."