Put down the salt and lime. Pick up a history book.
For most people in the U.S., Cinco de Mayo is about tequila shots and margaritas and everything that we think is 100 percent pure Mexico, but really is more just an excuse to party one more day out of the year. In reality, Cinco de Mayo is the celebration of Mexico's victory over the French forces at the Battle of Puebla in 1862.
If we celebrated every day in history when the French were defeated in battle ... well, national productivity would be at an all-time low, and late-night drunk food consumption would be at an all-time high. So, just remember that as you start partying on Cinco de Mayo. There's a reason to celebrate, but it's not sombreros.
Even though they're cool.