Direct cause was the Assassination of Archduke Franz Ferdinand
Indirect causes like the doubling of the French and German armies between 1870 and 1914 were also major causes
In addition, the world was now global and large countries were capable of making weapons of mass destruction and had the economic stability to do so. the stage was set for a war
August 2- Germany sent a request to Belgium to send troops through
August 3- Germans entered Belgium despite Belgiums refusal. The British gave Germany a choice either evacuate Belgium or face militaristic repercussions