June 1: Mexico declares war on Germany, Italy and Japan. - The Grand Coulee Dam is finished on the Columbia River.

June 4: Reinhard Heydrich succumbs to wounds sustained on May 27 from Czechoslovakian paratroopers acting in Operation Anthropoid.

June 5: The United States declares war on Bulgaria, Hungary & Romania.

June 4-June 7: The Battle of Midway: The Japanese naval advance in the Pacific is halted.

June 7: Japanese forces invade the Aleutian Islands (the first invasion of American soil in 128 years).

June 8: Attack on Sydney Harbour: The Australian cities of Sydney and Newcastle are shelled by Japanese submarines. The eastern suburbs of both cities are damaged and the east coast is blacked out.

June 9: Nazis burn the Czech village of Lidice in reprisal for the killing of Reinhard Heydrich. - (12:30 a.m.) - B-17 Flying Fortress air crash near Auckland.

June 10: The Gestapo massacres 173 male residents of Lidice, Czechoslovakia in retaliation for the killing of Reinhard Heydrich.

June 12: On her 13th birthday, Anne Frank makes the first entry in her new diary.

June 13: The United States opens its Office of War Information, a propaganda center.

June 18: The SS surrounds the church where Jan Kubis and Jozef Gabcik, the assassins of Reinhard Heydrich, are hiding. To avoid capture, the two men commit suicide.

June 29: The German Eleventh Army under Erich von Manstein takes Sevastopol, although fighting rages until July 9. (source: Wikipedia)