Key West, the end of a small chain of Islands off of Florida called keys. There are a series of bridges that connect them making it the closest U.S. city to Cuba that is accessible by car. A city in Puerto Rico might be closer, but I have no idea which one.
If you mean 'closest' not 'closet', it is Florida, actually the Florida Keys.
Many Florida cities were used used as military bases during the Spanish American war because nearly located Cuba was one of the main theaters of this war.
Florida
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The U.S. feared of having a Spanish colony so close to the United States.
No
Cuba is south of florida
America and Cuba both have American currency.
Americans cannot purchase things from Cuba because of a trade embargo that was imposed around the Cold War era because Cuba was (and still is) a Communist country and America was concerned about their close relations with the Soviet Union.
No, Cuba is on Cuban soil.
Cuba - APEX