What is not generally considered a factor that led to the start of World War I?
The various alliances among the major powers prior to the start of the War
The arms race between Germany and the United Kingdom leading up to the War
The assassination of Archduke Franz Ferdinand of Austria in Sarajevo by groups associated with Serbia
Russian mobilization of its army in defense of Serbia once Austria had declared war
The rise of the Bolsheviks in Imperial Russia
The various alliances among the major powers prior to the start of the War
The arms race between Germany and the United Kingdom leading up to the War
The assassination of Archduke Franz Ferdinand of Austria in Sarajevo by groups associated with Serbia
Russian mobilization of its army in defense of Serbia once Austria had declared war
The rise of the Bolsheviks in Imperial Russia