Why do we celebrate the Fourth of July? What to know about the holiday and its origins

The Fourth of July is Americana at its core: parades and cookouts and cold beer and, of course, fireworks.

Those pyrotechnics also make it an especially dangerous holiday, typically resulting in more than 10,000 trips to the emergency room. Yet fireworks remain at the center of Independence Day, a holiday 247 years in the making.

Here are five things to know about July Fourth, including the origin of the holiday, why we celebrate it and how fireworks became part of the tradition.

What's the origin of Independence Day?

The holiday celebrates the Second Continental Congress’ unanimous adoption of the Declaration of Independence on July 4, 1776, a document announcing the colonies’ separation from Great Britain.

One year later, according to the Library of Congress, a spontaneous celebration in Philadelphia marked the anniversary of American independence.

But across the burgeoning nation, observations didn’t become commonplace until after the War of 1812. It quickly took off: The Library of Congress notes that major historic events in the 19th century, such as groundbreaking ceremonies for the Erie Canal and the Baltimore and Ohio Railroad, were scheduled to coincide with Fourth of July festivities.

How did fireworks become a part of the Fourth of July tradition?

The display of pyrotechnics has been a big part of Independence Day from the outset. Founding Father John Adams saw it coming.

Commemoration of America’s independence “ought to be solemnized with Pomp and Parade, with Shews, Games, Sports, Guns, Bells, Bonfires and Illuminations from one End of this Continent to the other from this Time forward forever more,” Adams wrote in a letter to his wife, Abigail, dated July 3, 1776.

Fireworks were around centuries before America became a nation. The American Pyrotechnics Association says many historians believe fireworks were first developed in the second century B.C. in ancient China by throwing bamboo stalks into fires, causing explosions as the hollow air pockets overheated.

By the 15th century, fireworks were widely used for religious festivals and public entertainment in Europe and early U.S. settlers carried on those traditions, the association said.

Has a president ever refused to celebrate?

Presidents from George Washington to Joe Biden have celebrated the nation’s birth on the Fourth of July, with one exception: Adams.

His letter to his wife aside, Adams refused to celebrate the holiday on July 4 because he felt July 2 was the real Independence Day. Why? It was on July 2, 1776, that the Continental Congress voted in favor of the resolution for independence, though the Declaration of Independence wasn’t formally adopted until two days later.

Adams was so adamant that he turned down invitations to festivals and other events, even while serving as the nation’s second president. Ironically, Adams and Thomas Jefferson, the primary author of the Declaration of Independence, both died on the 50th anniversary of the document’s formal adoption, July 4, 1826.