The Alliance System Takes Down Europe

The assassination of its leader caused Austria-Hungary to declare war on little_____
But, Serbia had made an alliance with Russia.
So when Austria-Hungary attacked Serbia, the Russians came to their defense and declared war
on_____
This brought_______
into the war, because they had
an alliance to help Austria-Hungary.
And so on it went as nation after nation was forced to join the war because
of________
they had made.