How did the death of archduke frank instigate the collapse of peace for europe?

It started ww1, the archduke was killed by a Serbian nationalist

Russia mobilized to help its Balkan allies. Germany, due to its pact with Austria-Hungary, was forced to mobilize to help their allies. Knowing that France had a pact with Russia, Germany attacked it, heading through Belgium. Britain, since it remained an ally of Belgium, and to a lesser extent France, declared war on Germany. And so the Great War began. 

Iyou could write about is what u just wrote right that huge paragraph just take out the question and write to have your paper full the saratoga was running away from the spanish bc they had a kill in war that was supposed to be for the saratoga