Cause Of WWI

World War I was a military conflict that lasted from 1914 to 1918 and involved most of the world's great powers, assembled in two opposing alliances: the Allies (centred around the Triple Entente) against the Central Powers. The location were Europe, Africa and the Middle East (briefly in China and the Pacific Islands). It last for four years.
In the war of World War I, the side of the Allies, were made up of 27 states and those states are France, Britain, Italy, the United States, Rumania, Greece, Sebia and also Japan. Those countries were fought against the Central power, the countries are including Germany, Austria-Hungary, Turkey and Bulgaria.