Which geographic area was added to the united states after the louisiana state purchase?

The Oregon territory

Explanation:

During this time the U.S. was fulfilling the manifest destiny, which was the expansion of the U.S. westward. After the Louisiana purchase in 1803, the U.S. bought the Oregon territory in 1846, west of the Louisiana territory, thus partially fulfilling the manifest destiny.

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theodore roosevelt 26th u.s. president : i admire his energy and passion. he was a fundamentally good man, brilliantly intelligent, possessed of extraordinary will and ability, supremely self-confident, bold, egalitarian, idealistic…. , lord, can we have him back?