July 3 is the 184th day of the year (185th in leap years) in the Gregorian calendar; 181 days remain until the end of the year.
987 – Hugh Capet is crowned King of France, the first of the Capetian dynasty that would rule France until the French Revolution in 1792.
1035 – William the Conqueror becomes the Duke of Normandy, reigning until 1087.
1608 – Québec City is founded by Samuel de Champlain.
1754 – French and Indian War: George Washington surrenders Fort Necessity to French forces.
1767 – Pitcairn Island is discovered by Midshipman Robert Pitcairn on an expeditionary voyage commanded by Philip Carteret.
1767 – Norway's oldest newspaper still in print, Adresseavisen, is founded and the first edition is published.
1775 – American Revolutionary War: George Washington takes command of the Continental Army at Cambridge, Massachusetts.
1778 – American Revolutionary War: Iroquois allied to Britain kill 360 people in the Wyoming Valley massacre.
1819 – The Bank for Savings in the City of New-York, the first savings bank in the United States, opens.
1839 – The first state normal school in the United States, the forerunner to today's Framingham State University, opens in Lexington, Massachusetts with three students.
1848 – Governor-General Peter von Scholten emancipates all remaining slaves in the Danish West Indies.
1849 – France invades the Roman Republic and restores the Papal States. 1852 – Congress establishes the United States' 2nd mint in San Francisco.
1863 – American Civil War: The final day of the Battle of Gettysburg culminates with Pickett's Charge.
1884 – Dow Jones & Company publishes its first stock average.
1886 – The New-York Tribune becomes the first newspaper to use a linotype machine, eliminating typesetting by hand.
1890 – Idaho is admitted as the 43rd U.S. state.
1898 – A Spanish squadron, led by Pascual Cervera y Topete, is defeated by an American squadron under William T. Sampson in the Battle of Santiago de Cuba.
1913 – Confederate veterans at the Great Reunion of 1913 reenact Pickett's Charge; they are met by the outstretched hands of friendship from Union survivors.