In June 1776, as Thomas Jefferson composed a draft of the Declaration of Independence from a second floor parlor of a bricklayer's house in Philadelphia, the largest invasion force in British military history was headed for New York Harbor. By the time the last of the fifty-six signers had affixed their names to the final, edited document months later, an invading force of British soldiers had landed at Staten Island, the British had taken New York City, and the American patriots had committed themselves to a long and bloody struggle for liberty and independence.

The Declaration announced to the world the separation of the thirteen colonies from Great Britain and the establishment of the United States of America. It explained the causes of this radical move with a long list of charges against the King. In justifying the Revolution, it asserted a universal truth about human rights in words that have inspired downtrodden people through the ages and throughout the world to rise up against their oppressors.

Jefferson was not aiming at originality. The Declaration articulates the highest ideals of the Revolution, beliefs in liberty, equality, and the right to self-determination. Americans embraced a view of the world in which a person's position was determined, not by birth, rank, or title, but by talent, ability, and enterprise. It was a widely held view, circulated in newspapers, pamphlets, sermons, and schoolbooks; but it was Thomas Jefferson, the 33-year-old planter from Virginia, who put the immortal words to it.

On July 4, 1776, Congress completed its editing of the document that reduced the text by 25 percent ("mutilations" is what Jefferson called it) and formally adopted the Declaration; on July 19, Congress ordered that a formal copy of the Declaration be prepared for members to sign; and on August 2, the final parchment–the one presently displayed in the nearby case–was presented to Congress and the signing began.