Final answer:
James K. Polk was the eleventh president who oversaw the expansion of the U.S. through the annexation of Texas and Oregon.
Explanation:
James K. Polk was the eleventh president of the United States under whom the United States expanded through the annexation of Texas and Oregon. He won the election in 1844, focusing on territorial expansion as a major campaign issue. Polk's presidency also saw significant land additions to the United States, including 1.2 million acres by the end of his term.
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