Answer:
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."
Economic factors. The US wanted to take an empire to give it new markets in which to sell goods and from which to buy raw materials.
Military factors. This was the time of Alfred Thayer Mahan’s ideas about the dominant role of naval power. The US felt that taking an empire would give it more naval bases from which to project power. This would allow the US to become a more important power.
Cultural factors. Many Americans believed in the idea of the “white man’s burden.” They felt that they needed to go out and help to civilize the rest of the world.
The answer is C, preserving the Union. Lincoln famously said, "If I could preserve the Union without freeing a single slave, I would."
The Iron Curtain !
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