Answer :
Final answer:
The feature of the Monroe Doctrine that would protect U.S. national interest in the Oregon region is non-colonization. It opposes European colonization efforts in the Americas and helps ensure U.S. control.
Explanation:
Senator Benton believed that the feature of the Monroe Doctrine that could be used to protect the United States' national interest in the Oregon region was the principle of non-colonization. According to the doctrine, European colonization in the Americas would be seen as a threat to U.S. interests, and the U.S. would oppose any further colonization efforts. This feature would help protect the United States from potential European presence in the Oregon region, ensuring U.S. control and influence over the area.
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