From Wikipedia: During the American Revolution, the legal separation of the Thirteen Colonies from Great Britain in 1776 actually occurred on July 2, when the Second Continental Congress voted to approve a resolution of independence that had been proposed in June by Richard Henry Lee of Virginia declaring the United States independent from Great Britain rule. After voting for independence, Congress turned its attention to the Declaration of Independence, a statement explaining this decision, which had been prepared by a Committee of Five, with Thomas Jefferson as its principal author. Congress debated and revised the wording of the Declaration, finally approving it two days later on July 4.
- In 1777 thirteen gunshots were fired in salute, once at morning and once 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 in port were decked with red, white, and blue bunting.
- In 1778, from his headquarters at Ross Hall, near New Brunswick, New Jersey, General George Washington marked July 4 with a double ration of rum for his soldiers and an artillery salute (feu de joie). 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 the Massachusetts General Court became the first state legislature to recognize July 4 as a state celebration.
- In 1783, Moravians in Salem, North Carolina, held a celebration of July 4 with a challenging music program assembled by Johann Friedrich Peter. This work was titled The Psalm of Joy. This is recognized as the first recorded celebration and is still celebrated there today.
- In 1870 the U.S. Congress made Independence Day an unpaid holiday for federal employees.
- In 1938 Congress changed Independence Day to a paid federal holiday.