Why did the commander of the united states navy, alfred mahn, support the idea of expansionism?
a) he wanted to become the commander of a much larger navy, something that could only be accomplished through expansionism.
b) he believed that other countries would try and expand onto the united states-owned waters.
c) he wanted to expand the navy so that the country could stop recruiting for the army and marines.
d) he believed that the strength of a navy depends upon a battle-ready navy that should have bases for supplies and refueling around the world.

I’m pretty sure that the answer is b.

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.