Historians have proposed various causes of the First World War, including: Nationalism Imperialism Militarism The Alliance System A) Briefly explain why ONE of the developments on the list above represents the most significant cause of the First World War. Provide at least ONE piece of evidence to support your explanation. B) Briefly explain why ONE of the other developments on the list above represents a less significant cause of the First World War than the one you selected in part A. C) Briefly explain which ONE of the developments on the list above played a significant role in contributing to the cause of World War II.

In 911, a group of vikings lead by rollo besieged paris and chartres. after a victory near chartres on 26 august, charles decided to negotiate with rollo. the talks were led by hervé, the archbishop of reims. this resulted in the treaty of saint-clair-sur-epte, which granted rollo and his soldiers all the land between the river epte and the sea. it also granted him brittany, "for his livelihood". at the time, brittany was an independent land which france had not been able to conquer. in exchange, rollo promised the king his loyalty and military assistance when needed. also rollo also agreed to be baptised and to marry gisela, the king's daughter. the territory given rollo is about the same as upper normandy.