Causes of The First World War The First World War had many causes; the historians probably have not yet discovered and discussed all of them so there might be more causes than what we know now.  The spark of the Great War was the assassination of the Archduke Francis Ferdinand, heir to the throne of Austria-Hungary, and his wife by a Serbian nationalist on the morning of June 28, 1914, while traveling in a motorcade through Sarajevo, the capital city of Bosnia and Herzegovina. The Archduke was chosen as a target because Serbians feared that after his ascension to the throne, he would continue the persecution of Serbs living within t