Who delivered the first presidential inauguration under the United States Constitution?

George Washington delivered the first presidential inauguration under the United States Constitution.

Washington took the oath of office on April 30, 1789, at Federal Hall in New York City. Chancellor Robert R. Livingston administered the oath, and Washington then gave an inaugural address to Congress. The ceremony formally launched the executive branch of the constitutional government.

Washington had previously commanded the Continental Army during the Revolutionary War and presided over the 1787 Constitutional Convention. His election by the Electoral College was unanimous, making him the only president chosen unanimously through that system.

This event is sometimes confused with Washington’s second inauguration, which took place in Philadelphia in 1793. It is also distinct from the inauguration of John Adams, who became the second president in 1797. The first inauguration marked the transition from the Confederation Congress’s government to the new federal system.