Final answer:
The rise to power of Fidel Castro led to the Bay of Pigs invasion in Cuba.
Step-by-step explanation:
The event that led to the Bay of Pigs invasion was the rise to power of Fidel Castro. Fidel Castro, a communist leader, came into power in Cuba in 1959 after overthrowing the Cuban dictator Fulgencio Batista. The United States saw Castro's regime as a threat to their national interests, and in 1961, they plotted a failed invasion of Cuba to overthrow Castro.
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