Title: Outline of World War I
Content:  World War I was fought between the Allies and the Central Powers.
Title: War guilt question
Content:  Hostilities in World War I took place mostly in Europe between 1914 and 11 November 1918, and involved mobilization of 70 million military personnel and resulted in over 20 million military and civilian deaths (exclusive of fatalities from the 1918 Spanish flu pandemic, which accounted for millions more) making it one of the largest and deadliest wars in history. By July 1914, the great powers of Europe were divided into two coalitions: the Triple Entente, later called the "Allied Powers", consisting of France, Russia, and Britain; and the Triple Alliance of Germany, Austria-Hungary, and Italy (the "Central Powers"). After a series of events, ultimatums, and mobilizations, some of them due to interlocking alliances, Germany declared war on Russia on 1 August. Within days the other powers followed suit, and before the end of 
Title: United States World War I Centennial Commission
Content:  conflict. On April 6, 1917, Congress officially declared war against Germany and joined the Allied forces. Led by General John J. Pershing, the American Expeditionary Forces arrived in Europe in June 1917. American forces participated in several major battles, most notably the Meuse-Argonne offensive. This became a major turning point in the War, which had been at a stalemate for years. The War would finally end a year later on November 11, 1918. Over 4.7 million American men and women would serve, and more than 116,000 American soldiers, or "doughboys" as they were commonly referred to, would pay the ultimate sacrifice.
Title: International relations of the Great Powers (1814–1919)
Content:   The First World War was a global conflict that lasted from 1914 to 1918. It saw the Central Powers (Germany and Austria-Hungary, later joined by the Ottoman Empire and Bulgaria), fighting the "Entente" or "Allied" powers, led by Britain, Russia and France from 1914, who were later joined by Italy in 1915, and other countries such as Romania in 1916. The United States, initially neutral, tried to broker a settlement but in April, 1917, it declared war on Germany. The U.S. cooperated with the Allies but did not formally join them, and it negotiated peace separately. Despite overcoming Romania in 1916 (although Romania continued to fight until May 1918, later rejoining the war on November 1918) and Russia in March 1918, the Central Powers collapsed in November, 1918; and Germany accepted an "armistice" that in practice was a total surrender. Much of the diplomatic efforts of the 
Title: History of Europe
Content:   After the relative peace of most of the 19th century, the rivalry between European powers, compounded by a rising nationalism among ethnic groups, exploded in August 1914, when the First World War started. Over 65 million European soldiers were mobilised from 1914 to 1918; 20 million soldiers and civilians died, and 21 million were seriously wounded. On one side were Germany, Austria-Hungary, the Ottoman Empire and Bulgaria (the Central Powers/Triple Alliance), while on the other side stood Serbia and the Triple Entente – the coalition of France, Britain and Russia, which were joined by Italy in 1915, Romania in 1916 and by the United States in 1917. The Western Front involved especially brutal combat 
Title: Russian Civil War
Content:  The Russian Empire fought in World War I from 1914 alongside France and the United Kingdom (Triple Entente) against Germany, Austria-Hungary and later the Ottoman Empire (Central Powers).
Title: Europe
Content:   Two world wars and an economic depression dominated the first half of the 20th century. World War I was fought between 1914 and 1918. It started when Archduke Franz Ferdinand of Austria was assassinated by the Yugoslav nationalist Gavrilo Princip. Most European nations were drawn into the war, which was fought between the Entente Powers (France, Belgium, Serbia, Portugal, Russia, the United Kingdom, and later Italy, Greece, Romania and the United States) and the Central Powers (Austria-Hungary, Germany, Bulgaria and the Ottoman Empire). The war left more than 16 million civilians and military dead. Over 60 million European soldiers were mobilised from 1914 to 
Title: World War I
Content:   World War I, often abbreviated as WWI or WW1, also known as the First World War or the Great War, was a global war that began on 28 July 1914 and ended on 11 November 1918. It involved much of Europe, as well as Russia, the United States and Turkey, and was also fought in the Middle East, Africa and parts of Asia. One of the deadliest conflicts in history, an estimated 9 million were killed in combat, while over 5 million civilians died from occupation, bombardment, hunger or disease. The genocides perpetrated by the Ottomans and the 1918 Spanish flu pandemic spread by the movement 
Title: Military history of Europe
Content:  World War I was a global war fought chiefly in Europe from 1914 to 1918.
Title: Lost Generation
Content:  The Lost Generation is best known as being the cohort which primarily fought in World War 1. More than 70 million people were mobilised during the First World War, around 8.5 million of whom were killed and 21 million wounded in the conflict. About two million soldiers are believed to have been killed by disease, while individual battles sometimes caused hundreds of thousands of deaths. Around 60 million of the enlisted originated from the European continent, which saw its younger men mobilised on a mass scale. Most of Europe's great powers operated peacetime conscription systems where men were expected to do a brief period of military training in their youth before spending the rest of their lives in the army reserve. Nations with this system saw 

Question: who did us fight in world war 1?
Answer: Germany.
Austria-Hungary.