Why did president polk accept the 49th parallel as the northern border of the oregon territory

The Oregon boundary dispute or the Oregon Question was a 19th-century territorial dispute ... Democratic candidate James K. Polk appealed to the popular theme of ... War, Polk returned to his earlier position of a border along the 49th parallel. ... The diplomatic teams couldn't agree upon mutually satisfactory terms and Explanation:

it was because After a British minister rejected U.S. Presidents James K. Polk and John Tyler offer to settle the boundary at the 49th parallel north, American expansionists

as general terms,  indian territory,  the indian territories, or  indian country  describe an evolving land area set aside by the  united states government  for the relocation of  native americans  who held  aboriginal title  to their land. in general, the tribes ceded land they occupied in exchange for  land grants  in 1803. the concept of an indian territory was an outcome of the 18th- and 19th-century policy of  indian removal. after the  civil war(1861–1865), the policy of the government was one of  assimilation.