Cinco de Mayo is often confused with another Mexican holiday with more cachet south of the border: Dieciséis de Septiembre, which celebrates Independence Day. Mexico’s 10-year struggle to break free from Spain began Sept. 16, 1810 – half a century before the Battle of Puebla.
Conventional wisdom has it that US marketers had a clever hand in catapulting to popularity Cinco de Mayo, partly because it just rolls off the tongue even if you speak no Spanish. Now try saying Dieciséis de Septiembre.