National Orange Juice Day is celebrated every year on May 4 in the United States, recognizing one of the country's most popular beverages. The holiday commemorates the history of orange juice, which gained significant popularity during the mid-20th century, particularly after the introduction of frozen concentrated orange juice in 1948. This innovation was a response to American soldiers' dislike of vitamin C supplements during World War II. Today, orange juice is a breakfast staple, enjoyed for its refreshing taste and health benefits, and is the official drink of Florida since 1967. Common customs include enjoying a glass of orange juice with breakfast or making mimosas by mixing orange juice with sparkling wine. Major brands like Tropicana, Minute Maid, and Florida's Natural are prominent in the market.