What are the three key elements of the Monroe Doctrine?

the United States would not interfere in the internal affairs of or the wars between European powers; (2) the United States recognized and would not interfere with existing colonies and dependencies in the Western Hemisphere; (3) the Western Hemisphere was closed to future colonization

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john hunter was a scottish surgeon, he was a early advocate of careful observation and scientific method in medicine,

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b) the confederacy had to pay all union war expenses.