Cinco de Mayo is celebrated more in the United States of America, by Mexicans and Americans alike, than it is in Mexico. One theory for why it is more popular in the USA is that at one time, it was celebrated in all of Mexico and by Mexicans living in former Mexican territories such as Texas and California. It was ignored in Mexico after a while but still celebrated north of the border, which never got out of the habit of remembering the famous battle.
In Puebla and in many USA cities with large Mexican populations, there are parades, dancing and festivals. Traditional Mexican food is often served or sold. Mariachi bands fill town squares, and a lot of Dos Equis and Corona beers are served. It’s a fun holiday, really more about celebrating the Mexican way of life than about remembering a battle which happened 150 years ago. It is sometimes referred to as a “Mexican St. Patrick’s Day.” In the USA, schoolchildren do units on the holiday, decorate their classrooms and try their hand at cooking some basic Mexican foods. All over the world, Mexican restaurants bring in Mariachi bands and offer specials for what’s almost certain to be a packed house.