What was an outcome of Cuba’s decision to switch to a communist government? A.
The United States and Cuba became trade partners.

B.
Cuba and the Soviet Union became allies.

C.
Cuba and the United States aimed missiles at the Soviet Union.

D.
Cuba blocked all traded goods coming in from the Soviet Union

B. Cuba and the Soviet Union became allies.

The United States was concerned by Castro's anti-American rhetoric, his "radical" policies, and his association with a number of suspected leftists. So, due to Castro's "foreign ideology" (in the perspective of Americans), the United States was prompted to keep a wary eye on his administration.

Since the Soviet Union shared similar interests to promote and expand communism, they formed an alliance.

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