World war I was one the bloodiest wars the world had experience. Where it took place in Europe involving the countries Germany, Russia, France, Great Britain and the U.S. The main reasons why War World I accord was because Alliances were formed, militarism, and imperialism. One of the main underlying cause of the War was Alliances were being formed. They were formed in 1914, the same year the war started. The Alliances were Germany, Italy, and Austria hungary; then we had countries that were entente which were United Kingdom, Germany, and Austria-Hungary. Then we had Austria-Hungary declaring war on Serbia for killing the Duke, which rattle up the war. Another underlying cause was imperialism. Germany wanted to conquer every country they