Answer:Communism under Fidel Castro in Cuba was seen as a threat to America for several reasons:
Geopolitical concerns: Cuba is located only 90 miles from the United States, which made it a potential military threat to American national security.
Ideological differences: The communist ideology of Fidel Castro's government was at odds with the capitalist ideology of the United States, which led to political tensions and disagreements between the two nations.
Cold War context: During the Cold War, the United States and the Soviet Union were engaged in a global struggle for power and influence, and the spread of communism was viewed as a direct threat to American interests.
Fear of Soviet influence: The Soviet Union supported Cuba both militarily and economically, which led to concerns about Soviet influence in the Western Hemisphere and the potential for Soviet expansionism.
The Cuban Missile Crisis: In 1962, the discovery of Soviet missiles in Cuba nearly led to a nuclear war between the United States and the Soviet Union, which further heightened tensions between the two nations and strengthened the perception of Cuba as a threat to American security.