The Olive Branch Petition was adopted by the Second Continental Congress on July 5, 1775, and signed on July 8 in a final attempt to avoid war between Great Britain and the Thirteen Colonies in America. The Congress had already authorized the invasion of Canada more than a week earlier, but the petition affirmed American loyalty to Great Britain and beseeched King George III to prevent further conflict. It was followed by the July 6 Declaration of the Causes and Necessity of Taking Up Arms, however, which made its success unlikely in London. In August 1775, the colonies were formally declared to be in rebellion by the Proclamation of Rebellion, and the petition was rejected by the British government; King George had refused to read it before declaring the colonists traitors.

The Second Continental Congress was a meeting of delegates from the Thirteen Colonies in America that united in the American Revolutionary War. It convened on May 10, 1775, with representatives from 12 of the colonies in Philadelphia, Pennsylvania, shortly after the Battles of Lexington and Concord, succeeding the First Continental Congress which met in Philadelphia from September 5 to October 26, 1774. The Second Congress functioned as a de facto national government at the outset of the Revolutionary War by raising armies, directing strategy, appointing diplomats, and writing petitions such as the Declaration of the Causes and Necessity of Taking Up Arms and the Olive Branch Petition. All thirteen colonies were represented by the time the Congress adopted the Lee Resolution which declared independence from Britain on July 2, 1776, and the congress agreed to the Declaration of Independence two days later.

Afterward, Congress functioned as the provisional government of the United States of America through March 1, 1781. During this period, its achievements included: Successfully managing the war effort; drafting the Articles of Confederation, the first U.S. constitution; securing diplomatic recognition and support from foreign nations; and resolving state land claims west of the Appalachian Mountains.

Many of the delegates who attended the Second Congress had also attended the First. They again elected Peyton Randolph to serve as President of the Congress and Charles Thomson to serve as secretary. Notable new arrivals included Benjamin Franklin of Pennsylvania and John Hancock of Massachusetts. Within two weeks, Randolph was summoned back to Virginia to preside over the House of Burgesses; Hancock succeeded him as president, and Thomas Jefferson replaced him in the Virginia delegation. The number of participating colonies also grew, as Georgia endorsed the Congress in July 1775 and adopted the continental ban on trade with Britain.