Answer:
Alliance system was one of the "isms" that helped start WW1. The alliances between countries began to form before the war, then once Franz Ferdinand. the archduke of Austria Hungray was assissinated, the alliance system went into full effect.
Explanation:
Nations began protecting each othe, for example Russia prtoected Serbia from Austria Hungray. There were two major alliances the triple alliance power and triple Entente. The triple alliance powers had countries like,Austria -Hungary, Germany and Italy. The Triple Entente had The US and Great Britain France and Russia)
