When the initial battles in the Revolutionary War broke out in April 1775, few colonists desired complete independence from Great Britain, and those who did were considered radical.

By the middle of the following year, however, many more colonists had come to favor independence, thanks to growing hostility against Britain and the spread of revolutionary sentiments such as those expressed in the bestselling pamphlet “Common Sense,” published by Thomas Paine in early 1776.

On June 7, when the Continental Congress met at the Pennsylvania State House (later Independence Hall) in Philadelphia, the Virginia delegate Richard Henry Lee introduced a motion calling for the colonies’ independence.

Amid heated debate, Congress postponed the vote on Lee’s resolution, but appointed a five-man committee—including Thomas Jefferson of Virginia, John Adams of Massachusetts, Roger Sherman of Connecticut, Benjamin Franklin of Pennsylvania and Robert R. Livingston of New York—to draft a formal statement justifying the break with Great Britain.

On July 2nd, the Continental Congress voted in favor of Lee’s resolution for independence in a near-unanimous vote (the New York delegation abstained, but later voted affirmatively). On that day, John Adams wrote to his wife Abigail that July 2 “will be celebrated, by succeeding Generations, as the great anniversary Festival” and that the celebration should include “Pomp and Parade…Games, Sports, Guns, Bells, Bonfires and Illuminations from one End of this Continent to the other.”

On July 4th, the Continental Congress formally adopted the Declaration of Independence, which had been written largely by Jefferson. Though the vote for actual independence took place on July 2nd, from then on the 4th became the day that was celebrated as the birth of American independence.

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.