As a believer in manifest destiny, president polk promised to annex the territory in the pacific northwest known oregon country. the republic of texas. disputed territory. the republic of mexico.

I think the correct answer from the choices listed above is the first option. As a believer in Manifest Destiny, President Polk promised to annex the territory in the Pacific Northwest known as Oregon Country. Hope this answers the question. Have a nice day.

Americans agreed to the settlement terms established by the mexican government.