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1. World War 1 was started in August 1,1914 and ended in 1918 with the surrender of germany.
2. The main cause for happening this world war is the murder of Arduduke Franz Fernidad by a Serbian fanatic on june 28, 1918. this leads to World War 1
3. The other causes for happening these war are Aggressive Nationalism, Imperialism, Militarism, Secret Alliances.
It was mainly france britain usa russian against germany austria turkey among others 
5. and also the countries like Austria, Hungary, Belgium, Brazil, British, Bulgaria, China, France, Germany, Greece, Italy, Japan, Liberia, Montenegro, Portugal, Romania, Russia, Serbia, USA took part in world war 1
6. In first world war nearly 10 million people were killed.
7. It was ended with the conference on peace at Versailles in 1919.
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