What is the Monroe Doctrine?

After its inception in 1823, the Monroe Doctrine was largely ignored. But after a while, different administrations saw the value in maintaining control over the western hemisphere. And notably, it is having a renaissance in the Trump presidency.

So what IS the Monroe Doctrine? How has it been interpreted in various presidencies? And, most importantly, is it legal under international law? Civics 101 regular Dan Cassino takes us from Monroe to Maduro.

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