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In the aftermath of WWII, Western Europe was left devastated. The US government worried that if they didn't step into help, the Soviet Union would.

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For the first time since the 1700s, the US had formally tied its security to that of nations in Europe. (Peace since an attack against one would be an attack against all.)

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The Soviet Union promised to defend Cuba. The US prevented further Soviet shipments of missiles by making a blockade. Both sides came to an agreement, which prevented the start of WW3