 In 1914 Austrian Archduke Franz Ferdinand was assassinated by Bosnian Serb revolutionary Gavrilo Princip, resulting in Austria-Hungary accusing Serbia of involvement and subsequently declaring war on Serbia, resulting in a clash of alliances and the eruption of World War I.In spite of heavy casualties, Serbia benefited from its allies' eventual victory against Germany and Austria-Hungary, with Serbia subsequently joining with territories claimed by Yugoslav nationalists to form the Kingdom of Serbs, Croats, and Slovenes, informally known as Yugoslavia, in 1918.Serbian nationalists associated with a centralist vision of Yugoslavia as opposed to a confederal or federal state as advocated by non-Serbs.