The document summarizes the key participants and causes of World War 1. The major Allied powers were Great Britain, France, and Russia, while the Central powers were Germany and Austria-Hungary. The causes of WWI are summarized as militarism, alliances, nationalism, imperialism, and the assassination of Archduke Franz Ferdinand. Key battles discussed include the Battle of Marne, Battle of Somme, and the Battle of Verdun on the Western Front as well as the Battle of Tannenberg on the Eastern Front.