How was the Cuban missile crisis a turning point in U. S.-Soviet relations?

The Cuban Crisis was a significant key turning point in USA and USSR relations during the Cold War. Historians tag this event as the most intensified proxy war in the history of mankind, which nearly trigged a Nuclear War.

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map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.