The Lee Resolution for independence was passed on July 2 with no opposing votes. The Committee of Five had drafted the Declaration to be ready when Congress voted on independence. John Adams, a leader in pushing for independence, had persuaded the committee to select Thomas Jefferson to compose the original draft of the document, which Congress edited to produce the final version. The Declaration was a formal explanation of why Congress had voted to declare independence from Great Britain, more than a year after the outbreak of the American Revolutionary War. Adams wrote to his wife Abigail, "The Second Day of July 1776, will be the most memorable Epocha, in the History of America" – although Independence Day is actually celebrated on July 4, the date that the wording of the Declaration of Independence was approved.
After ratifying the text on July 4, Congress issued the Declaration of Independence in several forms. It was initially published as the printed Dunlap broadside that was widely distributed and read to the public. The source copy used for this printing has been lost and may have been a copy in Thomas Jefferson's hand. Jefferson's original draft is preserved at the Library of Congress, complete with changes made by John Adams and Benjamin Franklin, as well as Jefferson's notes of changes made by Congress. The best-known version of the Declaration is a signed copy that is displayed at the National Archives in Washington, D.C., and which is popularly regarded as the official document. This engrossed copy (finalized, calligraphic copy) was ordered by Congress on July 19 and signed primarily on August 2.
The sources and interpretation of the Declaration have been the subject of much scholarly inquiry. The Declaration justified the independence of the United States by listing 27 colonial grievances against King George III and by asserting certain natural and legal rights, including a right of revolution. Its original purpose was to announce independence, and references to the text of the Declaration were few in the following years. Abraham Lincoln made it the centerpiece of his policies and his rhetoric, as in the Gettysburg Address of 1863. Since then, it has become a well-known statement on human rights, particularly its second sentence:
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 has been called "one of the best-known sentences in the English language", containing "the most potent and consequential words in American history". The passage came to represent a moral standard to which the United States should strive. This view was notably promoted by Lincoln, who considered the Declaration to be the foundation of his political philosophy and argued that it is a statement of principles through which the United States Constitution should be interpreted.
The Declaration of Independence inspired many similar documents in other countries, the first being the 1789 Declaration of United Belgian States issued during the Brabant Revolution in the Austrian Netherlands. It also served as the primary model for numerous declarations of independence in Europe and Latin America, as well as Africa (Liberia) and Oceania (New Zealand) during the first half of the 19th century.
Thomas Jefferson, the principal author of the Declaration
Believe me, dear Sir: there is not in the British empire a man who more cordially loves a union with Great Britain than I do. But, by the God that made me, I will cease to exist before I yield to a connection on such terms as the British Parliament propose; and in this, I think I speak the sentiments of America.
By the time that the Declaration of Independence was adopted in July 1776, the Thirteen Colonies and Great Britain had been at war for more than a year. Relations had been deteriorating between the colonies and the mother country since 1763. Parliament enacted a series of measures to increase revenue from the colonies, such as the Stamp Act of 1765 and the Townshend Acts of 1767. Parliament believed that these acts were a legitimate means of having the colonies pay their fair share of the costs to keep them in the British Empire.
Many colonists, however, had developed a different conception of the empire. The colonies were not directly represented in Parliament, and colonists argued that Parliament had no right to levy taxes upon them. This tax dispute was part of a larger divergence between British and American interpretations of the British Constitution and the extent of Parliament's authority in the colonies. The orthodox British view, dating from the Glorious Revolution of 1688, was that Parliament was the supreme authority throughout the empire, and so, by definition, anything that Parliament did was constitutional. In the colonies, however, the idea had developed that the British Constitution recognized certain fundamental rights that no government could violate, not even Parliament. After the Townshend Acts, some essayists even began to question whether Parliament had any legitimate jurisdiction in the colonies at all. Anticipating the arrangement of the British Commonwealth, by 1774 American writers such as Samuel Adams, James Wilson, and Thomas Jefferson were arguing that Parliament was the legislature of Great Britain only, and that the colonies, which had their own legislatures, were connected to the rest of the empire only through their allegiance to the Crown.
The issue of Parliament's authority in the colonies became a crisis after Parliament passed the Coercive Acts (known as the Intolerable Acts in the colonies) in 1774 to punish the colonists for the Gaspee Affair of 1772 and the Boston Tea Party of 1773. Many colonists saw the Coercive Acts as a violation of the British Constitution and thus a threat to the liberties of all of British America, so the First Continental Congress convened in Philadelphia in September 1774 to coordinate a response. Congress organized a boycott of British goods and petitioned the king for repeal of the acts. These measures were unsuccessful because King George and the ministry of Prime Minister Lord North were determined to enforce parliamentary supremacy in America. As the king wrote to North in November 1774, "blows must decide whether they are to be subject to this country or independent".
Most colonists still hoped for reconciliation with Great Britain, even after fighting began in the American Revolutionary War at Lexington and Concord in April 1775. The Second Continental Congress convened at the Pennsylvania State House in Philadelphia in May 1775, and some delegates hoped for eventual independence, but no one yet advocated declaring it. Many colonists no longer believed that Parliament had any sovereignty over them, yet they still professed loyalty to King George, who they hoped would intercede on their behalf. They were disappointed in late 1775 when the king rejected Congress's second petition, issued a Proclamation of Rebellion, and announced before Parliament on October 26 that he was considering "friendly offers of foreign assistance" to suppress the rebellion. A pro-American minority in Parliament warned that the government was driving the colonists toward independence.