Cuban military forces are no longer present in Central America or Africa. The Defense Department has concluded that Cuba represents no security threat to the United States. Unilateral sanctions don't work. They don't change the behavior of the targeted country. When we stop our farmers and business people from exporting, they are hurt, and our foreign competitors happily rush in.
Unilateral sanctions cripple our foreign policy.
The irony is that the US embargo actually helps Castro. His economy is a shambles. The people's rights are repressed. Those are the direct results of Castro's misguided economic, political, and social policies. Yet he is able to use the embargo as the scapegoat, blaming us for his failed economic policies.