Triple Entente (Allied Powers): Britain, France, and Russia
Triple Alliance (Central Powers): Germany, Austria-Hungary, and Italy
June 28, 1914 Bosnian Serbs assassinated Archduke Ferdinand. Austria (with Germany) at war with Serbia (with Russia and France). Germany attacks Russia and then France. Invasion of neutral Belgium brought Britain into war. Montenegrins join Serbs. Japanese declare war on Germany. Turkey allies with Germany. Italy declares neutrality.