The Cuban Missile Crisis.

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The Cuban Missile Crisis involved the United States and the Soviet Union. It was the closest the two countries ever came to nuclear warfare. The two countries came into conflict when the U.S. discovered that the Soviets had placed nuclear missiles in Cuba.  At that time, the Soviets had no missiles that could reach the continental U.S. from Soviet territory.  By placing the missiles in Cuba, they would have gained the capability of hitting major U.S. cities with nuclear weapons.
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                                                                                                                                                                        Jennifer Bounds, Jessica Hargis, Summer Hornaday