[b]World War I[/b] (WWI), which was predominantly called the World War or [b]The Great War[/b] from its occurrence until 1939 ([[World War II]]), and the [b]First World War[/b] or World War I thereafter, was a major war centred in Europe. It began on 28 July 1914 when [[Austria]]-[[Hungary]] declared war against [[Serbia]] and lasted until 11 November 1918 after [b][[Germany]] and the Allies signed an armistice[/b].

The geopolitical changes it generated in most of the world after its eventual outcome were a direct cause for [[World War II]] more than 20 years later.

World War I is notable for stalemate [[trench]] warfare on the western front, and the development and application of new technology in warfare such as [[tank|tanks]], [[airplane|airplanes]] and [[submarine|submarines]].

h4.Factions 

[b]The Allied Powers[/b] 
* [[United Kingdom|British Empire]] 
* [[France]] 
* [[Russian Empire]] (until 1917)
* [[Belgium]]
* [[Japan|Empire of Japan]] 
* [[Italy]] (1915-1918)
* [[United states|United States]]  (1917-1918)

[b]The Central Powers[/b] 
* [[German Empire]] 
* [[Austria|Austro]]-[[Hungary|Hungarian]] [[Austria-Hungary|Empire]]
* [[Ottoman Empire]] 
* [[Bulgaria]] (1915-1918)

h4. Some battles

* Western Front
** [[Battle of Jutland]]

* Asian and Pacific theatre
** [[Siege of Tsingtao]]

h4. World War I in Popular Culture
* [[All Quiet On The Western Front]]
* [[1917 (Film)]]
* [[Battlefield 1]]

h4. See Also
* [[ptsd|Shell Shock]]
* [[tag_group:history]]

h4. External Links

* "Wikipedia article":http://en.wikipedia.org/wiki/World_War_I
第一次世界大戦 WW1