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Russia signs the Treaty of Brest-Litovsk with Germany. -
Archduke Francis Ferdinand is assassinated.
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Austria-Hungary declares war on Serbia, beginning World War I. -
Germany invades Luxembourg and Belgium. France invades Alsace. British forces arrive in France. Nations allied against Germany were eventually to include Great Britain, Russia, Italy, Australia, New Zealand, South Africa, Rhodesia, Romania, Greece, France, Belgium, United States, Canada, Serbia, India, Portugal, Montenegro, and Poland. -
Austria-Hungary invades Russia. -
Allied forces halt German advance into France during First Battle of the Marne. -
Germany begins naval blockade of Great Britain. -
Allied forces land on the Gallipoli Peninsula of the Ottoman Empire. -
Peace conference begins at Paris. -
Naval Battle of Jutland takes place between British and German fleets. -
United States severs diplomatic relations with Germany. -
The United States declares war on Germany. -
American combat forces arrive in France. -
Russia signs armistice with Germany. -
Germany begins its final offensive of the war. -
American women recruited to serve as bilingual telephone operators for the AEF arrive in Europe -
United States forces are victorious in the Battle of Cantigny, the first independent American operation. -
American First Army attacks St. Mihiel salient. -
Allied forces begin the attack at Meusse-Argonne, the final offensive of the war. -
Germany signs the Armistice at Compiègne, ending World War I. -
Draft of the covenant of the League of Nations is completed.