We’re in Mexico for Cinco de Mayo. What does this holiday commemorate?

We’re in Mexico for Cinco de Mayo. What does this holiday commemorate?

A Mexican Independence Day
B Mexico’s ‘birthday’
C Mexico’s victory at the Battle of Puebla

On May 5, or Cinco de Mayo, 1862, during the second French invasion of Mexico, the Battle of Puebla took place close to Puebla de Zaragoza.

The correct answer is Mexico’s victory at the Battle of Puebla.