Drawing Conclusions At first, the United States remained neutral inWorld War I. Why was unrestricted submarine warfare an important factor in causing the United States to enter the war?

On February 1, 1917, the lethal threat of the German U-boat submarine raises its head again, as Germany returns to the policy of unrestricted submarine warfare it had previously suspended in response to pressure from the United States and other neutral countries.

Explanation:

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i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.

they died because of a disease during the first spanish colonies.