Cinco De Mayo History: 7 Must-Know Facts About The Annual Celebration (PHOTOS)
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Cinco De Mayo, or the Fifth Of May, is being celebrated today in Mexico and parts of the United States.
The observance commemorates a major moment in Mexican history some 148 years ago.
Find out what that moment was and six other key facts about Cinco De Mayo and its history below. Rank each fact based on its importance in your mind.