Transportation became faster and cheaper
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Convinced that all of Latin America was vulnerable to European attack, President Roosevelt dusted off the Monroe Doctrine and added his own corollary. While the Monroe Doctrine blocked further expansion of Europe in the Western Hemisphere, the Roosevelt Corollary went one step further
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The activities that most demonstrated Americans' belief in Manifest Destiny occurred during the 19th century, while thousands of settlers moved west and displaced thousands of natives.
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Under the Constitution, the President as Commander in Chief of the Army and Navy is the supreme military commander charged with the responsibility of protecting and defending the United States
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