1914

The St. Petersburg–Tampa Airboat Line in the United States starts services between St. Petersburg and Tampa, Florida, becoming the first airline to provide scheduled regular commercial passenger services with heavier-than-air aircraft.

United States occupation of Veracruz: 2,300 U.S. Navy sailors and Marines from the South Atlantic fleet land in the port city of Veracruz, Mexico, which they will occupy for over six months. The Ypiranga incident occurs when they attempt to enforce an arms embargo against Mexico by preventing the German cargo steamer SS Ypiranga from unloading arms for the Mexican government in the port.

Assassination of Archduke Franz Ferdinand of Austria: Serbian nationalist Gavrilo Princip, 19, assassinates Archduke Franz Ferdinand of Austria and his wife, Duchess Sophie, in Sarajevo, Bosnia and Herzegovina, triggering the July Crisis overnight and eventually World War I. Anti-Serb riots in Sarajevo and Zagreb break out.

The Signal Corps of the United States Army establishes an Aviation Section, giving definite status to its air service for the first time.

German troops occupy Luxembourg, in accordance with the Schlieffen Plan.

The first engagement between capital ships (light cruisers) of the British Royal Navy and the Imperial German Navy occurs, when HMS Bristol pursues the SMS Karlsruhe (which escapes) in the West Indies.

September 2 – World War I: The Battle of Tannenberg begins between German and Russian forces.

World War I: The French village of Moronvilliers is occupied by the Germans.

The conclusion of the Battle of Grand Couronné ends the Battle of the Frontiers, with the north-east segment of the Western Front stabilising.

The 1914 Burdur earthquake occurs in Turkey.

World War I:

The New York Stock Exchange re-opens fully, having been closed since August 1, except for bond trading.