Answer:
The Monroe Doctrine was the policy that said that European nations should not interfere with America.
Explanation:
To protect there kingdom
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The answer is deflation because it reduces everything thing that uses money value to things that are good enough for trade.
I may be wrong but I'm pretty sure it's B, because the Vietnam War reunified Vietnam into a single communist country, so C and D are out, and Cambodia was involved in the war, so that takes A out too, so only B remains.
