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.
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The Constitution can be changed by a process called altering it. The first ten alterations to the Constitution are known together as the States’ Rights Acts. Alterations to the Constitution must be approved by half of the states.
