1863

The pivotal, three-day Civil War Battle of Gettysburg, resulting in a Union victory, began in Pennsylvania.

1903

The first Tour de France began.

1944

Delegates from 44 countries began meeting at Bretton Woods, New Hampshire, where they agreed to establish the International Monetary Fund and the World Bank.

1963

The U.S. Post Office inaugurated its five-digit ZIP codes.

1973

The Drug Enforcement Administration was established.

1997

Hong Kong reverted to Chinese rule after 156 years as a British colony.