What is World War I?
{{Infobox military conflict | conflict = World War I | image = WWImontage.jpg | image_size = 300 | caption = (Clockwise from the top) {{flatlist| * The aftermath of shelling during the [[Battle of the Somme]] * [[Mark V tank]]s cross the [[Hindenburg Line]] * {{HMS|Irresistible|1898|6}} sinks after hitting a [[Naval mine|mine]] in the [[Naval operations in the Dardanelles Campaign|Dardanelles]] * A British [[Vickers machine gun]] crew wears [[gas mask]]s during the Battle of the Somme * [[Albatros D.III]] fighters of [[Jagdstaffel 11]] }} | date = {{start and end dates|1914|7|28|1918|11|11|df=yes}}<br />({{Age in years, months, weeks and days|month1=7|day1=28|year1=1914|month2=11|day2=11|year2=1918}}) {{Collapsible list | bullets = yes | title = Peace treaties |[[Treaty of Versailles]]<br />Signed 28 June 1919<br />({{Age in years, months, weeks and days|month1=7|day1=28|year1=1914|month2=6|day2=28|year2=1919}}){{efn|The United States did not ratify any of the treaties agreed to at the [[Paris Peace Conference, 1919|Paris Peace Conference]].}}<!--Since World War I didn't actually end for most states until the Paris Peace Conference treaties were signed...--> |[[Treaty of Saint-Germain-en-Laye (1919)|Treaty of Saint-Germain-en-Laye]]<br />Signed 10 September 1919<br />({{Age in years, months, weeks and days|month1=7|day1=28|year1=1914|month2=9|day2=10|year2=1919}}) |[[Treaty of Neuilly-sur-Seine]]<br />Signed 27 November 1919<br />({{Age in years, months, weeks and days|month1=10|day1=14|year1=1915|month2=11|day2=27|year2=1919}}){{efn|Bulgaria joined the Central Powers on 14 October 1915.}} |[[Treaty of Trianon]]<br />Signed 4 June 1920<br />({{Age in years, months, weeks and days|month1=7|day1=28|year1=1914|month2=6|day2=4|year2=1920}}) |[[Treaty of Sèvres]]<br />Signed 10 August 1920<br />({{Age in years, months, weeks and days|month1=7|day1=28|year1=1914|month2=8|day2=10|year2=1920}}){{efn|The Ottoman Empire agreed to a secret alliance with Germany on 2 August 1914. It joined the war on t