How did the alliances help cause the World War I?

The alliances helped cause World War 1 because when Franz Ferdinand the Archduke of Austria-Hungary was assassinated along with his wife it caused Austria-Hungary to declare war on Serbia. This was what set off the alliances and all hell broke loose. Russia immediately jumped in to protect Serbia who they had an alliance with. Then Germany came in to protect Austria-Hungary and declared war first on Serbia but also on Russia and France. But to get to France it would need to go through Belgium and France and Britain declared war on Germany. The alliances were called the triple alliance and the triple entente. The triple alliance consisted of Germany, Austria and Italy. The triple entente included Britain, France and Russia.