<Ul> <Li> Treaty of Versailles Signed 28 June 1919 (4 years and 11 months) </Li> <Li> Treaty of Saint - Germain - en - Laye Signed 10 September 1919 (5 years, 1 month, 1 week and 6 days) </Li> <Li> Treaty of Neuilly - sur - Seine Signed 27 November 1919 (4 years, 1 month, 1 week and 6 days) </Li> <Li> Treaty of Trianon Signed 4 June 1920 (5 years, 10 months and 1 week) </Li> <Li> Treaty of Sèvres Signed 10 August 1920 (6 years, 1 week and 6 days) </Li> <Li> United States--Austria Peace Treaty Signed 24 August 1921 (3 years, 8 months, 2 weeks and 3 days) </Li> <Li> United States--Germany Peace Treaty Signed 25 August 1921 (4 years, 4 months, 2 weeks and 5 days) </Li> <Li> United States--Hungary Peace Treaty Signed 29 August 1921 (3 years, 8 months, 3 weeks and 1 day) </Li> <Li> Treaty of Lausanne Signed 24 July 1923 (8 years, 8 months, 3 weeks and 4 days) </Li> </Ul> <Li> Treaty of Versailles Signed 28 June 1919 (4 years and 11 months) </Li> <Li> Treaty of Saint - Germain - en - Laye Signed 10 September 1919 (5 years, 1 month, 1 week and 6 days) </Li> <Li> Treaty of Neuilly - sur - Seine Signed 27 November 1919 (4 years, 1 month, 1 week and 6 days) </Li>

When was world war 1 and who fought in it