Which body adopted the Declaration of Independence, marking the United States Semiquincentennial?

The Second Continental Congress adopted the Declaration of Independence, marking the United States Semiquincentennial.

The Second Continental Congress met during the American Revolution and acted as the de facto national government of the thirteen colonies. It first convened in Philadelphia in May 1775, after fighting had begun at Lexington and Concord.

On July 2, 1776, Congress approved the Lee Resolution declaring independence. On July 4, it adopted the Declaration, which provided a public explanation of that decision. The document was drafted primarily by Thomas Jefferson and revised by Congress.

The First Continental Congress had met in 1774 to coordinate colonial resistance and petition Britain. It did not adopt the Declaration; that action belonged to its successor, the Second Continental Congress.