James K. Polk expected to achieve access to the Pacific Ocean through manifest destiny.
What is manifest destiny?
Manifest destiny was a widely maintained artistic idea in the 19th-century of the US that American immigrants were fated to develop across North America.
Newspaper skilled worker John O'Sullivan is typically attributed with stamping the term manifest destiny.
He thought that it was God's choice for the US to travel from the Atlantic all the route to the Pacific Ocean.
Therefore, that conveyed that he was in favor of accepting Texas, Oregon, California, and New Mexico.
Therefore, option A is correct.
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