Date 28 July 1914 – 11 November 1918 (1914-07-28 – 1918-11-11 ) (4 years, 3 months and 2 weeks) Peace treaties
Treaty of Versailles Signed 28 June 1919
(4 years and 11 months)
Treaty of Saint-Germain-en-Laye Signed 10 September 1919
(5 years, 1 month, 1 week and 6 days)
Treaty of Neuilly-sur-Seine Signed 27 November 1919
(4 years, 1 month, 1 week and 6 days)
Treaty of Trianon Signed 4 June 1920
(5 years, 10 months and 1 week)
Treaty of Sèvres Signed 10 August 1920
(6 years, 1 week and 6 days)
United States–Austria Peace Treaty Signed 24 August 1921
(3 years, 8 months, 2 weeks and 3 days)
United States–Germany Peace Treaty Signed 25 August 1921
(4 years, 4 months, 2 weeks and 5 days)
United States–Hungary Peace Treaty Signed 29 August 1921
(3 years, 8 months, 3 weeks and 1 day)
Treaty of Lausanne Signed 24 July 1923
(8 years, 8 months, 3 weeks and 4 days)
Location Europe, Africa, the Middle East, the
Pacific Islands , China, Indian Ocean, North and South Atlantic Ocean
Result Allied victory
Territorial changes Formation of new countries in Europe and the Middle East Transfer of German colonies and territories, regions of the former Ottoman Empire , regions of the former Austro-Hungarian Empire and Soviet Union territories to other countries
Total: 42,959,850 12,000,000 8,841,541 8,660,000 5,615,140 4,743,826 1,234,000 800,000 707,343 380,000 250,000 50,000Total: 25,248,321 13,250,000 7,800,000 2,998,321 1,200,000Military dead : 5,525,000Military wounded : 12,831,500Total: 18,356,500 KIA, WIA and MIACivilian dead: 4,000,000further details ...
Military deaths by country
1,811,000 1,397,800 1,114,914 651,000 250,000–335,000 275,000 116,708 58,637–87,500 26,000 3,000 415Military dead: 4,386,000Military wounded: 8,388,000Total: 12,774,000 KIA, WIA and MIACivilian dead: 3,700,000further details ...
Military deaths by country
2,050,897 1,200,000 771,844 87,500