July 4th holiday

Why the fourth?
Though the Fourth of July is iconic to Americans, some claim the date itself is somewhat arbitrary. New Englanders had been fighting Britain since April 1775. The first motion in the Continental Congress for independence was made on June 4, 1776. After hard debate, the Congress voted unanimously, but secretly, for independence from the Kingdom of Great Britain on July 2 (see Lee Resolution). The Congress reworked the text of the Declaration until a little after eleven o'clock, July 4, when the twelve colonies voted for adoption and released a copy signed only by John Hancock, President of the Congress, to the printers. (The New York delegation abstained from both votes.) Philadelphia celebrated the Declaration with public readings and bonfires on July 8. Not until August 2 would a fair printing be signed by the members of the Congress, but even that was kept secret to protect the members from British reprisals.
John Adams, credited by Thomas Jefferson as the unofficial, tireless whip of the independence-minded, wrote to his wife Abigail on July 3, 1776:
The second day of July, 1776, will be the most memorable epoch in the history of America. I am apt to believe that it will be celebrated by succeeding generations as the great anniversary festival. It ought to be commemorated as the day of deliverance, by solemn acts of devotion to God Almighty. It ought to be solemnized with pomp and parade, with shows, games, sports, guns, bells, bonfires, and illuminations, from one end of this continent to the other, from this time forward forever more.
Adams was off by two days, however. Certainly, the vote on July 2 was the decisive act. But July 4, 1776 is the date on the Declaration itself. Jefferson's stirring prose, as edited by the Congress, was first adopted by the July 4th vote. It was also the first day Philadelphians heard the official news of independence from the Continental Congress, as opposed to rumors in the street about secret votes.

[edit] Observance
In 1777, thirteen guns were fired, once at morning and again as evening fell, on July 4 in Bristol, Rhode Island. Philadelphia celebrated the first anniversary in a manner a modern American would find quite familiar: an official dinner for the Continental Congress, toasts, 13-gun salutes, speeches, prayers, music, parades, troop reviews and fireworks. Ships were decked with red, white and blue bunting.
In 1778, General George Washington marked the Fourth of July with a double ration of rum for his soldiers and an artillery salute. Across the Atlantic Ocean, ambassadors John Adams and Benjamin Franklin held a dinner for their fellow Americans in Paris, France.
In 1779, July 4 fell on a Sunday. The holiday was celebrated on Monday July 5.
In 1781, Massachusetts was the first legislature to recognize the Fourth of July.
In 1783, Moravians in Salem, North Carolina held the first celebration of the Fourth of July in the country with a challenging music program assembled by Johann Friedrich Peter. This work was titled the Psalm of Joy.
In 1791, the first recorded use of the name "Independence Day".
In 1870, the U.S. Congress made Independence Day a holiday, albeit unpaid, for federal employees [1]
In 1941, the U.S. Congress made Independence Day a federal paid holiday. The residents of Vicksburg, Mississippi celebrated the Fourth of July for the first time in 78 years, since the Siege of Vicksburg ended with a Union victory during the American Civil War on July 4, 1863.