Indigenous peoples of Mexico
When Mexico gained independence in 1821, the casta system was eliminated as a legal structure, but racial divides remained. 
White Mexican argued about what the solution was to the "Indian Problem", that is indigenous who continued to live in communities and were not integrated politically or socially as citizens of the new republic. The Mexican constitution of 1824 has several articles pertaining to indigenous peoples. The second article of the constitution of Mexico recognizes and enforces the right of indigenous peoples and communities to self-determination and therefore their autonomy to:
Battle of Puebla
A common misconception in the United States is that Cinco de Mayo is Mexico's Independence Day, the most important national patriotic holiday in Mexico. Mexico celebrates Independence Day on the 16th of September, commemorating the beginning of the war of Independence (September 16, 1810, the "Cry of Dolores"). Mexico also observes the culmination of the war of Independence, which lasted 11 years, on the 27th of September.