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Independence Day is a federal holiday in the United States commemorating the adoption of the Declaration of Independence on July 4, 1776. The Continental Congress declared that the thirteen American colonies regarded themselves as free and independent states, the United States of America, and were no longer connected to the British Crown. The Congress actually voted to declare independence two days earlier, on July 2.

 NOTABLE CELEBRATIONS

•  Held since 1785, the Bristol Fourth of July Parade in Bristol, Rhode Island, is the oldest continuous Independence Day celebration in the United States. 
• Since 1959, the International Freedom Festival is jointly held in Detroit, Michigan and Windsor, Ontario during the last week of June each year as a mutual celebration of Independence Day and Canada Day (July 1). It culminates in a large fireworks display over the Detroit River. 
• The famous Macy's fireworks display usually held over the East River in New York City has been televised nationwide on NBC since 1976. In 2009, the fireworks display was returned to the Hudson River for the first time since 2000 to commemorate the 400th anniversary of Henry Hudson's exploration of that river. 
• The Boston Pops Orchestra has hosted a music and fireworks show over the Charles River Esplanade called the "Boston Pops Fireworks Spectacular" annually since 1973. 
• On the Capitol lawn in Washington, D.C., A Capitol Fourth, a free concert broadcast live by PBS, NPR, and the American Forces Network, precedes the fireworks and attracts over half a million people annually. 

Source: Wikipedia