Portal:United States/Anniversaries/January/January 4
- 1777 – American general George Washington defeats British general Charles Cornwallis at the Battle of Princeton.
- 1865 – The New York Stock Exchange opens its first permanent headquarters, at 10-12 Broad near Wall Street in New York City.
- 1896 – Utah is admitted as the 45th U.S. state.
- 1903 – Topsy, an elephant, is electrocuted by the owners of Luna Park in Coney Island, New York City.
- 1965 – President Lyndon B. Johnson delivers a State of the Union address in which he outlines his "Great Society", a platform centered around the elimination of racial injustice and poverty.
- 2004 – Spirit (pictured), one of a pair of Mars Exploration Rovers sent to survey the geology of Mars, makes a successful landing. Its twin, Opportunity rover would land on the opposite side of the planet three weeks later.