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The name for this idea is "Domino Effect" - this is a theory that says that if one country falls to Communism the neighboring countries would also fall to Communism, much like pieces of Dominos fall when a neighboring piece fell.
This theory was important in the Foreign politics of the US during the cold war.
The United States and the Japanese.
I think the answer is B but I'm not sure sorry
Germany's resumption of unrestricted submarine warfare
