Why Did World War I Happen?

World War I, a war that lead to the deaths of 15 million people, started with the assignation of Archduke Ferdinand of Austria on June 28, 1914. How did the assignation of one leader result in armed conflict involving more than 20 countries from multiple continents? The answer to this question and more is answered in this well-researched book, which combines primary source documents with other features to provide an unbiased look at the events of World War I.