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Franz Ferdinand
Ferdinand - and his wife Sophie - were killed by Serb nationalist Gavrilo Princip while on a formal visit to Sarajevo. Princip shot Ferdinand at point blank range while the latter was travelling in his car from a town hall reception, having earlier that day already survived one assassination attempt. -
Austria Hungary declares war on Serbia
Threatened by Serbian ambition in the tumultuous Balkans region of Europe, Austria-Hungary determined that the proper response to the assassinations was to prepare for a possible military invasion of Serbia. -
Germany declares war on Russia
Germany was Allies with Austria Hungary, and Austria-Hungary declared war on Serbia in response to the assassination of Archduke Franz Ferdinand by Serbian nationalists. Russia was allies with Serbia. So it drug Germany into the war to -
Germany declares war on France
They went to war with France because they figured that they could do a sneak atack on France and try to take over it by useing the shlieflen plan. But it didnt work.