In the pre-Revolutionary years, colonists had held annual celebrations of the king’s birthday, which traditionally included the ringing of bells, bonfires, processions and speechmaking. By contrast, during the summer of 1776 some colonists celebrated the birth of independence by holding mock funerals for King George III as a way of symbolizing the end of the monarchy’s hold on America and the triumph of liberty.

Festivities including concerts, bonfires, parades and the firing of cannons and muskets, usually accompanied the first public readings of the Declaration of Independence, beginning immediately after its adoption. Philadelphia held the first annual commemoration of independence on July 4, 1777, while Congress was still occupied with the ongoing war.

George Washington issued double rations of rum to all his soldiers to mark the anniversary of independence in 1778, and in 1781, several months before the key American victory at the Battle of Yorktown, Massachusetts became the first state to make July 4th an official state holiday.

After the Revolutionary War, Americans continued to commemorate Independence Day every year, in celebrations that allowed the new nation’s emerging political leaders to address citizens and create a feeling of unity. By the last decade of the 18th century, the two major political parties—the Federalist Party and Democratic-Republicans—that had arisen began holding separate Fourth of July celebrations in many large cities.

The first fireworks were used as early as 200 BC. The tradition of setting off fireworks on the 4 of July began in Philadelphia on July 4, 1777, during the first organized celebration of Independence Day. Ship’s cannon fired a 13-gun salute in honor of the 13 colonies. The Pennsylvania Evening Post reported: “at night there was a grand exhibition of fireworks (which began and concluded with thirteen rockets) on the Commons, and the city was beautifully illuminated.” That same night, the Sons of Liberty set off fireworks over Boston Common.

The tradition of patriotic celebration became even more widespread after the War of 1812, in which the United States again faced Great Britain. In 1870, the U.S. Congress made July 4th a federal holiday; in 1941, the provision was expanded to grant a paid holiday to all federal employees.

Over the years, the political importance of the holiday would decline, but Independence Day remained an important national holiday and a symbol of patriotism.

Falling in mid-summer, the Fourth of July has since the late 19th century become a major focus of leisure activities and a common occasion for family get-togethers, often involving fireworks and outdoor barbecues. The most common symbol of the holiday is the American flag, and a common musical accompaniment is “The Star-Spangled Banner,” the national anthem of the United States.

https://www.history.com/articles/july-4th