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Unrestricted submarine warfare was first introduced in World War I in early 1915, when Germany declared the area around the British Isles a war zone, in which all merchant ships, including those from neutral countries, would be attacked by the German navy. -
At the outbreak of World War I in 1914, the U.S. declared neutrality as Wilson tried to negotiate a peace between the Allied and Central Powers. He narrowly won re-election in the 1916 United States presidential election, boasting how he kept the nation out of wars in Europe and Mexico. -
The First Battle of the Marne was a battle of the First World War fought from 5 to 12 September 1914. It was fought in a collection of skirmishes around the Marne River Valley. It resulted in an Entente victory against the German armies in the west. -
The RMS Lusitania was a UK-registered ocean liner that was torpedoed by an Imperial German Navy U-boat during the First World War on 7 May 1915, about 11 nautical miles off the Old Head of Kinsale, Ireland. -
The Battle of Verdun was fought from 21 February to 18 December 1916 on the Western Front in France. The battle was the longest of the First World War and took place on the hills north of Verdun-sur-Meuse -
Sussex Incident, (March 24, 1916), torpedoing of a French cross-Channel passenger steamer, the Sussex, by a German submarine, leaving 80 casualties, including two Americans wounded. The attack prompted a U.S. threat to sever diplomatic relations. -
The Battle of the Somme, also known as the Somme offensive, was a battle of the First World War fought by the armies of the British Empire and French Third Republic against the German Empire. It took place between 1 July and 18 November 1916 on both sides of the upper reaches of the Somme, a river in France. -
Wilson was re-nominated at the 1916 Democratic National Convention a few days later, without opposition. While Wilson's Vice President Thomas R. Marshall was re-nominated, Hughes's running mate was Charles W. Fairbanks, who had been Theodore Roosevelt's vice president in his second term. -
he first American Expeditionary Forces' (AEF) contingent landed in France in late June 1917 at Saint-Nazaire. The war would soon enter its fourth year with no end in sight. Every French family had been touched by the injury and loss of loved ones, and the austerities of war. -
On April 4, 1917, the U.S. Senate voted in support of the measure to declare war on Germany. The House concurred two days later. The United States later declared war on German ally Austria-Hungary on December 7, 1917. -
The Selective Service Act of 1917 or Selective Draft Act authorized the United States federal government to raise a national army for service in World War I through conscription. -
Congress enacted the Espionage Act of 1917 on June 15, two months after the United States entered World War I. Just after the war, prosecutions under the act led to landmark First Amendment precedents. -
On 17 January 1917, British intelligence intercepted the Zimmermann telegram, leading to one of the first occasions when a piece of SIGINT (intelligence gained by eavesdropping on an enemy's coded communications) heavily influenced the course of world events. -
The 1918 influenza pandemic, commonly known by the misnomer Spanish flu or as the Great Influenza epidemic, was an exceptionally deadly global influenza pandemic caused by the H1N1 influenza A virus. -
The Fourteen Points was a statement of principles for peace that was to be used for peace negotiations in order to end World War I. The principles were outlined in a January 8, 1918 speech on war aims and peace terms to the United States Congress by President Woodrow Wilson. -
The Fourteen Points was a statement of principles for peace that was to be used for peace negotiations in order to end World War I. The principles were outlined in a January 8, 1918 speech on war aims and peace terms to the United States Congress by President Woodrow Wilson. -
On March 3, 1918, in the city of Brest-Litovsk, located in modern-day Belarus near the Polish border, Russia signs a treaty with the Central Powers ending its participation in World War I. -
The Sedition Act of 1918 curtailed the free speech rights of U.S. citizens during the time of war. Passed on May 16, 1918, as an amendment to Title I of the Espionage Act of 1917, the act provided for further and expanded limitations on speech. -
The Meuse–Argonne offensive was a major part of the final Allied offensive of World War I that stretched along the entire Western Front. It was fought from September 26, 1918, until the Armistice of November 11, 1918, a total of 47 days -
Armistice on the Western Front. On Nov. 11, 1918, after more than four years of horrific fighting and the loss of millions of lives, the guns on the Western Front fell silent. Although fighting continued elsewhere, the armistice between Germany and the Allies was the first step to ending World War I. -
The Paris Peace Conference was an international meeting convened in January 1919 at Versailles just outside Paris. The purpose of the meeting was to establish the terms of the peace after World War.