So far, this is what I think:
Religious tensions: The OE was mainly Muslim, and the countries surrounding it were Orthodox. A holy war, perhaps?
Claiming lost land: Since the OE was weakening, maybe it thought if it joined the war it would regain lost land. If the OE joined the Triple Alliance, it could get the land directly next to it if it won, countries in the Triple Entente.
Revenge: Getting back at the countries that were trying to take the land from the OE, such as Russia, by becoming allies with Rusia's enemy's such as Germany and Austria-Hungary.
So, what do you think are the reasons? Am I close to what everyone here thinks? Or am I horribly wrong?
