Cinco de Mayo marks Mexico’s against-all-odds victory against invading French troops in 1862.

But to some Americans, it’s simply Cinco de Drinko, an excuse to party with little to no understanding of what the Mexican holiday celebrates. Many who think they know what Cinco de Mayo is about wrongly assume it’s Mexico’s Independence Day. (It’s not.)

“Everyone thinks that it’s just party time, it’s Corona time,” said Mario García, a Chicanx historian from the University of California at Santa Barbara.

“It’s OK for people to go out and have a good time on a holiday like Cinco de Mayo — at least they have some sense that it’s some kind of a Mexican holiday,” García said. “But we should go beyond that. We should have Cinco de Mayo events that go beyond partying and drinking, where we call attention to what the history is.”

So what does Cinco de Mayo celebrate?

Mexican Independence Day, or Día de la Independencia, came on Sept. 16, 1810, when the country broke free of Spanish rule.

Cinco de Mayo came more than 50 years later when French Emperor Napoleon III wanted to claim Mexico for himself.

The French sent troops to force Mexico’s President Benito Juárez and the government out of Veracruz. On May 5, 1862, in a small town in east-central Mexico called Puebla, 2,000 Mexican soldiers faced 6,000 French troops at daybreak. Incredibly, Mexico claimed victory by the evening, and Juárez declared May 5 a national holiday.

The battle also played a role in the American Civil War. With the French defeated and leaving North America, the Confederacy wasn’t able to use them as an ally to win the war.

So why are so many Americans still confused?

Part of the confusion among many Americans about what Cinco de Mayo celebrates is likely because it’s much catchier-sounding and easier for English speakers to say than the day of Mexico’s independence (Diez y seis de Septiembre), García said.