Independence Day commemorates the legal separation of the original thirteen colonies from Great Britain. The actual separation occurred on July 2, 1776, when the Second Continental Congress voted to approve The Resolution for Independency (aka the “Lee Resolution”). That Resolution, approved about a year after the start of the American Revolutionary War, declared the independence of the United States from the oppressive rule and tyranny of Great Britain.
After debate and revisions, Congress approved the final wording of the Declaration of Independence on July 4, 1776. A fancy handwritten copy of the final document was prepared for signing. That copy was signed by most of the congressional delegates on August 2, 1776. The signed copy was published and widely distributed to the public. Because the published copy contained the date of approval—July 4, 1776—that date became the one associated with our independence from Britain. At first, the 4th of July was not widely celebrated, but Independence Day eventually become a national holiday in 1870.