Cinco de Mayo, celebrated on May 5th, marks Mexico's victory over France in 1862. In the U.S., it’s a festive celebration of Mexican culture.

It's actually more popular in the United States than in Mexico. And it may have helped tip the American Civil War in favor of the Union.

While threatened tariffs on Mexican avocados have been put on pause, the U.S. government plans to put a nearly 21% duty on fresh Mexican tomatoes starting July 14. A duty — like a tariff — is a tax on imports, and this one will impact the 4 billion pounds of tomatoes the U.S. imports from Mexico each year.