American expansionism in the 19th and early 20th centuries was driven by a combination of factors, but one of the most significant motivations was the belief in Manifest Destiny. This ideology held that it was the United States' divine right and duty to expand its territory across North America and beyond. Manifest Destiny encompassed a sense of American exceptionalism, the desire for economic opportunity, the pursuit of land for agriculture and settlement, and the belief in spreading democracy and civilization.
In addition to Manifest Destiny, other motivations included:
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Economic Interests: The desire for new markets, raw materials, and agricultural land spurred expansion. Industrial growth in the U.S. created a need for resources and new markets to sustain that growth.
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Strategic Considerations: Gaining territory for military and naval bases was important for national defense and international presence.
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Social Factors: Some believed that expanding the U.S. would help spread Christianity and "civilize" indigenous peoples.
While multiple factors were at play, the ideology of Manifest Destiny is often regarded as a central driving force behind American expansionism during this period.