On this date, September 16th, in the year 1810, Miguel Hidalgo (a parish priest in the central highlands of the Spanish colony of México) declared independence from Spain. What began as a peasants' rebellion against colonial rule led to nearly eleven years of war, with the coup d'état against Ferdinand VII (the last Bourbon monarch of Spain) in 1820 setting the conditions for recognized Mexican independence.
The annual celebration of "Cinco de Mayo" is not related to early Mexican independence, but rather to México's initial victory over French forces at Puebla in 1862. Cinco de Mayo is a relatively minor holiday in most of México (despite what many cerveza advertisers would have you believe).
Author-Blogger John Robb has posted recently on "system disruptions" affecting PEMEX's distribution pipelines in México; click here (10-Sep) and here (15-Sep). What a way to celebrate your 197th anniversary of independence....