It's America's birthday on July 4. Picnics, barbecues, cold drinks, fireworks and music are just some of the staples of the Fourth of July holiday.

America’s Founding Fathers — George Washington, John Adams, Thomas Jefferson, Benjamin Franklin, James Madison, Alexander Hamilton and James Monroe — have all played a major role in America's independence.

There are many things that people still don't know about this day. Here are some fun Independence Day trivia to share, courtesy of History.com and Fourth of July Trivia.

1. Two people signed the Declaration of Independence on the Fourth of July, which became a paid federal holiday in 1938.

2. Calvin Coolidge, the 30th president of the U.S., was born on the Fourth of July in 1872.

3. Three of the first five U.S. presidents died on the Fourth of July — John Adams, Thomas Jefferson and James Monroe all died on Independence Day.

4. America is not the only country that celebrates the Fourth of July. This day is also featured in Denmark and Norway, as well as Britain, Portugal and Sweden.

5. On Aug. 2, 1776, most signers of the Declaration of Independence actually signed the document.

6. The initial fireworks to celebrate the Fourth of July were ignited in 1777 to commemorate the first anniversary of the American colonies’ Declaration of Independence.

7. The Pennsylvania Evening Post first printed the Declaration of Independence.

8. There is apparently a message written upside down at the bottom of the signed document: “Original Declaration of Independence dated 4th July 1776.”

9. Nearly 2.5 million people lived in the U.S. when the Declaration was signed.

10. President Thomas Jefferson was the first to hold a Fourth of July celebration at the White House.

4th of july
People watch the Macy's 4th of July Firework Show from Brooklyn in New York City, July 4, 2017. REUTERS/Andrew Kelly

.