When it was known that he was really coming, the Bosnian revolutionists laid their plans. They found out just where his carriage was to pass, and at almost every street corner, they had some assassin with bomb or pistol. One bomb was thrown at him, but it exploded too soon, and he escaped. Bursting with indignation, he was threatening the mayor for his lax policing, when a second assassin, a nineteen year old boy, stepped up with a pistol and shot to death the archduke and his wife.
Many people have referred to this incident as the cause of the great European war. As you have been shown, however, this was simply the spark that exploded the magazine. With the whole situation as highly charged as it was, any other little spark would have been enough to set the war a-going.
The Austrian government sent word to Serbia that the crime had been traced to Serbian plotters, some of them in the employ of the government. It demanded that Serbia apologize; also that she hunt out and punish the plotters at once. And because Austria did not trust the Serbians to hold an honest investigation, she demanded that her officers should sit in the Serbian courts as judges.
Imagine a Japanese killed in San Francisco, and think what the United States would say if the Tokio government insisted that a Japanese judge be sent to California to try the case because Japan could not trust America to give her justice! The Serbians, of course, were in no position to fight a great power like Austria-Hungary, and yet, weakened as they were, they could not submit to such a demand as this. They agreed to all the Austrian demands except the one concerning the Austrian judges in Serbian courts. They appealed to the other powers to see that justice was done them.
Russia growled ominously at Austria, whereupon Germany sent a sharp warning to Russia that this was none of her affair, and that Austria and Serbia must be left to fight it out. In the meantime, Serbia offered to lay the matter before the court of arbitration at the Hague. (In 1899, at the invitation of the czar of Russia, representatives of all the great powers of Europe met at the Hague to found a lasting court which should decide disputes between nations fairly, and try to do away with wars, to as great an extent as possible. The court has several times been successful in averting trouble.)