Flag Day is a holiday celebrated in the United States on June 14. It commemorates the adoption of the flag of the United States on June 14, 1777, by resolution of the Second Continental Congress, which established that the flag of the thirteen United States should consist of thirteen stripes, alternating red and white, with thirteen stars on a blue field representing a new constellation. The idea of honoring the flag on this date was first proposed in 1861 to rally support for the Union during the American Civil War. June 14 was declared Flag Day by President Woodrow Wilson in 1916, and it was officially established as National Flag Day by an Act of Congress on August 3, 1949. Flag Day is not an official federal holiday, but the President of the United States issues an annual proclamation to observe the day and encourages Americans to display the flag. The week including June 14 is also designated as National Flag Week, during which people are urged to fly the American flag. Flag Day is celebrated with ceremonies, parades, and other patriotic events across the country. Some states and communities have additional commemorations, and the National Flag Day Foundation also observes the day with events including flag-raising ceremonies and recitations of the Pledge of Allegiance. In summary, Flag Day is a day to honor the American flag and its symbolism, celebrated annually on June 14 in the United States to mark the flag's official adoption in 1777. The day is observed with patriotic displays and various ceremonies reflecting national pride and heritage.