<span>\OREGON TREATY OF 1846. This assention set the limit between the United States and Canada at the 49th parallel west of the Rocky Mountains, veering aroundVancouver Island and afterward continuing through the Strait of San Juan de Fuca Hope this helps i actually paraphrased this answer so it wouldnt be plagrized.</span>
It was primarily "<span>d. the vulnerability to invaders from the north", since the Mongol territory was rapidly expanding--making the Mongol warriors all the more powerful. </span>
