Which statement best completes the diagram? Cause= The Monroe Doctrine; Effect=? A. Europe loses power in the Americas.

B. Russia gains territory in North America.

C. The United States gains new colonies.

D. Spain declares war in the United States.

Europe loses power in the Americas

Explanation: I got it correct

to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.

the answer is false.