The Central Powers consisted of Austria-Hungary, Bulgaria, Germany and the Ottoman Empire (now Turkey).
The Allied Powers consisted of Belgium, France, Great Britain, Greece, Italy, Montenegro, Portugal, Romania, Russia
, Serbia and the United States.
The United States declared neutrality until German submarine warfare threatened American commercial shipping.
US Troop Statistics:
(Source: Defense Casualty Analysis System
Battle deaths: 53,402
Non-battle deaths: 63,114
Total deaths: 116,516
Total US soldiers wounded: 204,002
Total number of US troops that served in the conflict: 4,734,991
Other Military Casualties by Country:
(Source: Encyclopedia Britannica
1,200,000 dead; 3,620,000 woundedBelgium:
13,716 dead; 44,686 woundedBulgaria:
87,500 dead; 152,390 woundedFrance:
1,357,800 dead; 4,266,000 woundedGermany:
1,773,700 dead; 4,216,058 woundedGreat Britain:
908,371 dead; 2,090,212 woundedGreece:
5,000 dead; 21,000 woundedItaly:
650,000 dead; 947,000 wounded Japan:
300 dead; 907 woundedMontenegro:
3,000 dead; 10,000 woundedOttoman Empire (Turkey):
325,000 dead; 400,000 woundedPortugal:
7,222 dead; 13,751 woundedRomania:
335,706 dead; 120,000 woundedRussia:
1,700,000 dead; 4,950,000 woundedSerbia:
45,000 dead; 133,148 woundedGrand total (including US):
8,528,831 dead; 21,189,154 wounded
June 28, 1914 - Gavrilo Princip, who has ties to the Serbian terrorist-type group the Black Hand, assassinates Archduke Franz Ferdinand of Austria-Hungary.
July 28, 1914 - Austria-Hungary declares war on Serbia.
August 1, 1914 - Germany declares war on Russia.
August 2, 1914 -
Ottoman Empire and Germany sign a secret treaty of alliance
August 4, 1914 - Germany invades Belgium. President Woodrow Wilson declares that the United States is neutral. Britain declares war on Germany.
August 10, 1914 - Austria-Hungary invades Russia, opening the fighting on the Eastern Front.
August 26-30, 1914 - Battle of Tannenberg, Prussia.
September 12, 1914 - First battle of the Aisne in France begins, marking the beginning of trench warfare.
November 3, 1914 - Russia declares war on the Ottoman Empire.
November 5, 1914 - Great Britain and France declare war on the Ottoman Empire.
April 22-May 25, 1915 - Second Battle of Ypres, marking the first wide-scale use of poison gas by Germany.
May 7, 1915 - A German U-20 submarine sinks the British passenger ship, the Lusitania; 1,198 are killed, including 128 Americans.
June 1915-November 1917 - Battles of the Isonzo, Italy.
1915 - Battle of Krithia, Gallipoli peninsula, Ottoman Empire.
February 21-July 1916 - Battle of Verdun, France, the war's longest battle, with almost a million casualties.
May 31-June 1, 1916 - Battle of Jutland, North Sea near Denmark - a sea battle between British and German navies.
July 1, 1916-November 1916 - First Battle of the Somme River, France. The British introduce the tank.
April 6, 1917 -
The United States declares war against Germany after the interception and publication of the Zimmermann Telegram
and the sinking of three US merchant ships
by German U-boats.
June 26, 1917 - American troops begin landing in France.
November 20, 1917 - Battle of Cambrai, France.
December 3, 1917 - Russia signs an armistice with Germany.
March 3, 1918 - Russia signs the Treaty of Brest-Litovsk, ending hostilities with the Central Powers and withdrawing Russia from this war.
March 21-April 5, 1918 - Second Battle of the Somme River.
September 29, 1918 - Bulgaria signs an armistice.
October 30, 1918 - Ottoman Empire signs an armistice.
November 3, 1918 - Austria-Hungary signs an armistice.
November 11, 1918 - Germany accepts the armistice terms demanded by the Allies, ending the war.
June 28, 1919 -
The Treaty of Versailles is signed at the Palace of Versailles