Because I feel like it.
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Excerpt from Boston Globe, July 4th 1903
Serbia has Civil War! Austria Ends it!
Von Rudna installed as King!
As I'm sure you know, Serbia has recently endured a brief civil war. A group of officers tried to kill the King of Serbia. They failed, but refused to give up and a brutal civil war ensued.
Austria, hungry as ever, seized the opportunity to increase her power in the region. Intervening for their own good, they blundered their way into supporting King Alexander. They then set about destroying all opposition forces. Within three weeks they had done their work.
After the war, the victors held a funeral for Draga. It was at this time disaster struck again. The Serbian King had stepped out to be alone for a minute, presumably to weep over Draga. Suddenly a young man appeared out of the shadows and shot him six times. Alexander reportedly grabbed ahold of his assassin by the forearms and thanked him before dying. The assassin disappeared after this, and still remains at large.
Immediately afterwards, the Austrians put Theodore Nikolic von Rudna on the throne. This was supposedly in keeping with the late King's wishes. In either case, the Austrians concluded a treaty of friendship with Serbia a few days later in an almost unnecessarily hasty manner.
The treaty insures that the two countries will come to each other's aid and that they will never war again. This is rather obviously an attempt by Austria to increase her influence in the region. Time will tell if this works out in their favor.