One of the Cuban Missile Crisis during 1962 was one among the most perilous incidents of the Cold War era, bringing the world to the edge of a nuclear showdown. The crisis emerged when the American government found out that the Soviet Union had placed nuclear warheads in Cuba, just approximately 90 miles from U.S. shores. https://articles.abilogic.com/698679/what-caused-cuban-missile-crisis.html