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national day is a day on which celebrations mark the statehood or nationhood of a state or its people. It may be the date of independence, of becoming a republic, of becoming a federation, or a significant date for a patron saint or a ruler. The national day is often a public holiday. Many countries have more than one national day. Denmark and the United Kingdom are the only countries without a national day. Britain abandoned Empire Day, while Denmark has what is not a public holiday but an unofficial celebration called Constitution Day. National days emerged with the age of nationalism, with most appearing during the 19th and 20th centuries.