Samuel J. Battle became the first black New York City policeman on June 28, 1911.

World History:

In 1215 (on June 15), King John of England signed the Magna Carta, considered the first step toward representative government in England.

In 1914 (on June 28), Austrian Archduke Francis Ferdinand and his wife were assassinated.

In 1919 (on June 28), the Treaty of Versailles formally ended World War I.

Invasions:

On June 6, 1944 D-Day: Allies invaded Normandy Beach in World War II.

On June 22, 1941, Nazi Germany invaded the Soviet Union.

On June 25, 1950, North Korea invaded South Korea, beginning the Korean War.

The United States intervened on the side of South Korea.

American History:

In 1667 (on June 21), the Dutch ceded New Amsterdam (New York City) to England.

In 1775 (on June 15) George Washington became Commander and Chief of the Continental Army.