One of the Cuban Missile Crisis of 1962 in 1962 was one of the most perilous times of the Cold War, leading the globe to the brink of a nuclear showdown. The crisis arose when the United States found out that the USSR had stationed nuclear warheads in Cuba, just about 90 miles from U.S. shores. https://articles.abilogic.com/698679/what-caused-cuban-missile-crisis.html