Independence Day is a national holiday marked by patriotic displays. Similar to other summer-themed events, Independence Day celebrations often take place outdoors. Independence Day is a federal holiday, so all non-essential federal institutions (like the postal service and federal courts) are closed on that day. Many politicians make it a point on this day to appear at a public event to praise the nation's heritage, laws, history, society, and people.
Families often celebrate Independence Day by hosting or attending a picnic or barbecue and take advantage of the day off and, in some years, long weekend to gather with relatives. Decorations (e.g., streamers, balloons, and clothing) are generally colored red, white, and blue, the colors of the American flag. Parades often are in the morning, while fireworks displays occur in the evening at such places as parks, fairgrounds, or town squares.
Independence Day fireworks are often accompanied by patriotic songs such as the national anthem "The Star-Spangled Banner", "God Bless America", "America the Beautiful", "My Country, 'Tis of Thee", "This Land Is Your Land", "Stars and Stripes Forever", and, regionally, "Yankee Doodle" in northeastern states and "Dixie" in southern states. Some of the lyrics recall images of the Revolutionary War or the War of 1812.
Firework shows are held in many states, and many fireworks are sold for personal use or as an alternative to a public show. Safety concerns have led some states to ban fireworks or limit the sizes and types allowed. Illicit traffic transfers many fireworks from less restrictive states.
A salute of one gun for each state in the United States, called a “salute to the union,” is fired on Independence Day at noon by any capable military base.
In 2009, New York City had the largest fireworks display in the country, with over 22 tons of pyrotechnics exploded. Other major displays are in Chicago on Lake Michigan; in San Diego over Mission Bay; in Boston on the Charles River; in St. Louis on the Mississippi River; and on the National Mall in Washington, D.C. During the annual Windsor-Detroit International Freedom Festival, Detroit, Michigan hosts one of the world's largest fireworks displays, over the Detroit River, to celebrate Independence Day in conjunction with Windsor, Ontario's celebration of Canada Day.
While the official observance always falls on July 4th, participation levels may vary according to which day of the week the 4th falls on. If the holiday falls in the middle of the week, some fireworks displays and celebrations may take place during the weekend for convenience, again, varying by region.