Why was it important to “contain” communism?

They didn't want communism to spread throughout the rest of Europe. They feared something called the domino effect and believed if communism spread to one country it would also get into all nearby countries.

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a more perfect union: the creation of the u.s. constitution. the vote was unanimous. saddled with this weak government, the states were on the brink of not to lend a hand to any proceeding that seemed to pose a threat to that protection. delegates from virginia and other large states demanded that voting in