The American steamer Aztec is torpedoed without warning by a German U-boat as it enters British waters. Twenty-eight Americans drown. ...

Supported by British gunboats traveling up the Tigris River, Anglo-Indian troops continue their advance toward Baghdad; upon arrival they discover the Turks have abandoned the city. Mesopotamia is...

Intercepted weeks earlier by the British intelligence service, the United States is alerted about the Zimmermann Telegram. In the decoded message, German Foreign Minister Arthur Zimmermann promises...

The Democrats run on the slogan, “He kept us out of war.” The Republican candidate, Charles Evans Hughes, is perceived as a warmonger and loses the election.

News of Armenian massacres began to surface in Europe and America in August of 1915, and began causing outrage and alarm. Nearly a year later, these events were addressed within the German government...

The peace plan includes independence for Poland, restoration of Belgian independence, the return of Alsace-Lorraine to France, an end to secret diplomacy, autonomy of subject nationalities and the...

Thirty-six tanks are secretly shipped to the front and used in the Battle of Flers-Courcelette, near the Somme. However, mechanical malfunctions and inexperienced crews greatly hampered the tanks...

Treaty of Brest-Litovsk is signed by Soviet Russia and Germany. Germany sets harsh terms: Russia yields 34% of her population, 32% of her farmland, 50% of her industrial holdings and 90% of her...

The disease, known as the “Spanish flu,” spreads through contact or close proximity to infected persons. It is carried from the U.S. overseas on troop ships to the Western Front and then throughout...

In an effort to draw German troops away from Verdun, the Allies mount a major offensive that opens with a large-scale artillery barrage that lasts five days. In one day, as German machine gunners rake...