World War I started on July 28, 1914, and it ended with an Allied victory on November 11, 1918. During the war, the Russian Empire collapsed and there were several new European countries that emerged. Learn more about WWI at http://www.ask.com/wiki/World_War_I
World War I started in July 28, 1914. The four major variables that led to this war are militarism, alliances, imperialism and nationalism. Here's the link for more information: http://www.ask.com/wiki/World_War_I.