The primary way in which the Hundred Years’ War changed warfare in Europe is that it was the first "total" war, in the sense that all resources were mobilized to fight.
The bombing of Pearl Harbor brought the United States into WW2. The United States stayed out of the way until this event because it was the breaking point for the nation. America had been attacked without what they deemed was a good reason and hundreds had been killed and injured.
Answer:
C.
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