On April 19, 1775, a detachment of the British regular Army marched inland from Boston, Massachusetts, in search of a cache of arms and with orders to arrest certain prominent local leaders. At Lexington, they confronted and fired upon a small group of local militia, who had gathered on the town common, or "green." Further along their line of march, they confronted a much larger group of militia at a bridge in Concord, and were turned back. Retreating to Boston, the British soldiers were subjected to continual sniper attacks. The Battle of Lexington and Concord, coming after a dozen years of escalating political conflict between the colonies and the British Parliament, marked the beginning of the American Revolution.

             On May 10, 1775, the Second Continental Congress, with representatives from thirteen of the British colonies along the Atlantic Coast of North America, began meeting in Philadelphia, Pennsylvania. The Congress immediately began to organize a federal government for the thirteen associated colonies, taking over governmental functions previously exercised by the King and Parliament of Great Britain, and directed the several States to prepare State constitutions for their own governance. The Congress appointed George Washington to head a Continental Army, and dispatched him to Boston, where the local militia was besieging a British Army.

             After a year of warfare, the Congress declared the United States of America independent of Great Britain in the Declaration of Independence. The drafting of the Declaration was the responsibility of a committee of five, which included, among others, John Adams and Benjamin Franklin, but the style of the document is attributed primarily to Thomas Jefferson. However, Jefferson's work was reviewed by Franklin at length and then submitted to the Congress where numerous changes were made, including the exclusion of his charges against George III regarding slavery.