Associated Press

On July 1, 1863, the pivotal, three-day Civil War Battle of Gettysburg, resulting in a Union victory, began in Pennsylvania.

In 1867, Canada became a self-governing dominion of Great Britain as the British North America Act took effect. Called Dominion Day until 1982, the national holiday is now known as Canada Day.

In 1903, the first Tour de France began.

In 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.

In 1963, the U.S. Post Office inaugurated its five-digit ZIP codes.

In 1973, the Drug Enforcement Administration was established.

In 1997, Hong Kong reverted to Chinese rule after 156 years as a British colony.