The document summarizes the key causes and events of World War 1: 1) Militarism, alliances, nationalism, and imperialism contributed to rising tensions in Europe. The assassination of Archduke Franz Ferdinand sparked war after Austria-Hungary declared war on Serbia. 2) As countries honored their alliance agreements, Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria formed the Central Powers against the Allied Powers of Britain, France, Russia, Italy, and later the United States. 3) Over 8 million troops were killed and 21 million wounded or captured by the war's end in 1918. The Treaty of Versailles imposed punitive terms on Germany and established the League of Nations.