Some of the earliest American Cinco de Mayo celebrations were held in California.
Mexican-American communities in California began observing the 1862 victory soon after news of the Battle of Puebla reached the United States. The celebrations expressed solidarity with Mexico and opposition to French imperial ambitions, which were viewed in the context of the American Civil War.
California had deep historical and demographic links to Mexico, making it a natural location for early commemorations. Over time, the observance spread to other parts of the United States and developed into a broad celebration of Mexican heritage.
Modern American Cinco de Mayo events may include parades, music, dancing, food, and educational programs. Their scale and style vary by community, and they should not be treated as a direct measure of how widely the date is observed as a public holiday in Mexico.