In the United States, the belief that the Pacific Ocean was the logical boundary for national expansion was expressed in:

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Manifest Destiny was the 19th-century doctrine or belief that the expansion of the US throughout the American continents was both justified and inevitable. It was a widely held belief that American settlers were destined to expand across North America, which included the idea that the Pacific Ocean would be the nation's natural boundary.

In the United States, the Belief That the Pacific Ocean