The philosophy drove 19th-century U.S. territorial expansion and was used to justify the forced removal of Native Americans and other groups from their homes. The rapid expansion of the United States intensified the issue of slavery as new states were added to the Union, leading to the outbreak of the Civil War.
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the correct answer is 3:
<em>According to Article II, Section 2, Clause I of the Constitution, the President of the United States is </em>“Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States"
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