Which territory was gained in 1846 through a treaty agreement with England that set the US-Canadian border at the 49th parallel? A. the Oregon Territory B. the Mexican Cession C. the Gadsden Purchase D. the Texas Annexation

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The right answer is A, the Oregon Treaty. Hope this helps!
the oregon territory. it starts at Oregon and it is the straight line at the top part of the U.S.(not including Alaska and Hawaii)