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Definition: Was a landmark United States Supreme Court case in which the Court formed the basis for the exercise of judicial review in the United States under Article III of the Constitution.

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Definition: A principle of US policy, originated by President James Monroe in 1823, that any intervention by external powers in the politics of the Americas is a potentially hostile act against the US.

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Definition: The route over which settlers traveled to Oregon in the 1840s and 1850s; trails branched off from it toward Utah and California. The Oregon Trail passed through what is now Missouri, Kansas, Nebraska, Wyoming, and Idaho.

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Definition: The 19th-century doctrine or belief that the expansion of the US throughout the American continents was both justified and inevitable.

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Definition: (1803) was a land deal between the United States and France, in which the U.S. acquired approximately 827,000 square miles of land west of the Mississippi River for $15 million.