An Alliance System was a group of nations and/or people that worked together to achieve a certain goal. In WW1, an Alliance System was a group of nations and/or people that worked together to attack an enemy nation.
Answer:
A. The incident caused the United States to immediately declare war on Germany.
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A. It wanted access to resources and materials.
I am very sure on this subject just a couple of months ago I wrote a 10 page report on Japan in World War 2. Especially on the Pearl Harbor attacks.