When did World War I begin?

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World War 1 began on July 28, 1914 with the assassination of the Archduke of Austria, Franz Ferdinand. The war officially ended with the signing of the Treaty of Versailles on June 28, 1919. 

 

However, it is important to realize that not all of the involved countries entered the war in 1914. 

 

1914:

Austria declares war on Serbia
Germany declares war on Russia
Germany declares war on France
Britain enters war
Japan declares war on Germany
Turkey enters war
Russia, Britain, and France declare war on Turkey

1915:

Italy enters war

1916:

Romania enters war

1917:

US declares war on Germany

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