The dispute over the oregon boundary was between the united states and what country?

great britain
france
spain
mexico

the dispute was between the US and Great Britain

Explanation:

Great Britain was the former "owner" of the oregon territory. the territory was given to the US after the war of 1812. Great britain also controled the canadian land that met the oregon border.

the decreasing neutrality of the u. s. in world war i

hope this : )

yup! you are correct it is b.