- Jun 1 US Senate confirms Louis Brandeis for the Supreme Court of the United States, by a vote of 47 to 22, over 4 months after his nomination
- Jun 2 Battle of Verdun: German troops, under Lt Rackow, launch attack on Fort Vaux with flamethrowers, forcing French defenders inside. The fort changes hand 16 times during the entire Battle of Verdun.
- Jun 3 US National Defense Act establishes Reserve Officers Training Corps
- Jun 4 General Aleksei Brusilov begins a massive Russian offensive on the Eastern Front (WWI)
- Jun 5 Louis Brandeis (59) is sworn in as an Associate Justice of the Supreme Court of the United States; he serves until 1939
- Jun 5 The Sherif Hussein proclaims a revolt of the Arabs in the province of Hejaz, an action that undermines the Turkish Empire
Yuan Shikai Dies
Jun 6 The death of Yuan Shikai, ruler of much of China since 1912, causes central government to virtually collapse in the face of pressure from warlords, and from political reformers including Sun Yat-Sen
- Jun 6 Voters in East Cleveland, Ohio approve women suffrage
Roosevelt Declines Nomination
Jun 7 Theodore Roosevelt declines nomination of the Progressive Party and throws his support behind Republican Charles Evans Hughes
- Jun 8 Battle of Verdun: Germans capture Fort Vaux after several days of intense fighting
- Jun 10 48th Belmont: E Haynes aboard Friar Rock wins in 2:22
- Jun 10 Hashemite-led Arabs of the Hejaz rise up against the ruling Ottoman Empire in the Great Arab Revolt of World War I
- Jun 12 US National Championship Women's Tennis, Forest Hills, NY: Defending champion Molla Bjurstedt outclasses Louise Hammond Raymond 6-0, 6-1
Democratic Convention
Jun 14 Democratic Convention convenes in St Louis; Woodrow Wilson campaigns on the slogan "he kept out of the war"
- Jun 14 Representatives of eight Allied nations hold an economic conference in Paris at which they discuss ways to cripple their enemies economic power during and after the war
Boeing Model 1
Jun 15 Boeing Model 1 [B & W Seaplane], the 1st Boeing product, flies for the 1st time
- Jun 15 Boys Scouts of America forms
- Jun 16 MLB Boston Brave's pitcher Tom Hughes no-hitter beats Pittsburgh, 2-0; at the time it is his 2nd career no-hitter, but a 1991 rule change wiped his 1910 effort [1]
- Jun 16 Passing of the Military Services Bill introduces conscription in New Zealand
- Jun 17 1st national congress of Sarekat Islam at Bandoeng Java
- Jun 17 US troops under General Pershing march into Mexico
- Jun 21 Boston Red Sox pitcher Rube Foster no-hits New York Yankees, 2-0 at Fenway Park
- Jun 21 Mexican troops defeat US expeditionary force under General Pershing
Pickford's Million Dollar Contract
Jun 24 Mary Pickford becomes the first female film star to get a million dollar contract
In Splendid Spirits
Jun 30 British General Douglas Haig reports "The men are in splendid spirits" the day before the Battle of the Somme begins
US Men's Open
Jun 30 US Open Men's Golf, Minikahda GC: Amateur Chick Evans leads wire-to-wire to set new Open scoring record and win his only Open title, 2 strokes ahead of runner-up Jock Hutchison
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