The event that helped cause the Cuban Missile Crisis was the Bay of Pigs invasion. Here's why:
1. The Bay of Pigs invasion was a failed military invasion of Cuba by Cuban exiles supported by the U.S. government in April 1961. The invasion aimed to overthrow the Cuban government led by Fidel Castro.
2. The failure of the Bay of Pigs invasion embarrassed the U.S. government and increased tensions between the U.S. and Cuba.
3. As a response to the Bay of Pigs invasion, Cuba sought support from the Soviet Union, which led to the placement of Soviet missiles in Cuba, triggering the Cuban Missile Crisis in October 1962.
Therefore, out of the events listed, the Bay of Pigs invasion directly contributed to the chain of events that led to the Cuban Missile Crisis.