The Declaration of Independence is the document that announced America's separation from Great Britain in 1776. Written primarily by Thomas Jefferson and adopted by the Continental Congress on July 4, the Declaration explained to the world why the thirteen American colonies were breaking away to form their own nation.

The document opens with one of history's most famous sentences: “We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.” This means the colonists believed everyone deserves basic rights that no government should take away.

The Declaration lists specific complaints against King George III, explaining how he had violated the colonists' rights. It argues that when a government stops protecting people's rights, those people have the right to create a new government. This was a radical idea in 1776, when most of the world lived under kings and emperors.

The Declaration didn't just start a war (that had already begun). It expressed principles about human dignity and self-government that influenced revolutions and democratic movements around the world. Americans celebrate Independence Day every July 4 to commemorate when the Declaration was adopted, marking the birth of the United States as an independent nation.