Why was the Monroe Doctrine of such importance to the United States? It announced that the United States was ready to enter into military alliances with European powers It announced that the United States was ready to enter into military alliances with European powers It expanded the influence of the United States in the Western Hemisphere It expanded the influence of the United States in the Western Hemisphere It gained rights for American merchants to harbor their ships in ports around the world It gained rights for American merchants to harbor their ships in ports around the world It demonstrated that Americans would not engage in actions affecting areas beyond their own borders

It expanded the influence of the United States in the Western Hemisphere

Explanation:

The Monroe Doctrine's importance to the United States was that "It expanded the influence of the United States in the Western Hemisphere."

This is evident in the fact that James Monroe, the former United States President who is 1823, asked the European powers to stay away from the affairs of the countries in the American continents (both South and North America). In turn, this gave the United States to declare itself as the police of the Western Hemisphere.

Hence, the correct answer, in this case, is "It expanded the influence of the United States in the Western Hemisphere."

d.he wanted to send diplomats to communist countries.