Final answer:
Manifest Destiny is the belief held by Americans in the 19th century that it was their destiny and duty to expand westward and settle the entire American continent.
Step-by-step explanation:
The idea of Manifest Destiny emerged in the 19th century as a belief among Americans that it was their destiny and duty to expand westward and settle the entire American continent. This belief was fueled by a sense of American exceptionalism and a desire for territorial expansion. Examples of Manifest Destiny can be seen in actions such as the Louisiana Purchase and the annexation of Texas.
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