Which political faction was most upset when the United States and Britain split territory in Oregon at the forty-ninth parallel?

Question

Quizplus · Accepted Answer

Northern Democrats were most upset because they had supported the slogan "Fifty-Four Forty or Fight," advocating for the U.S. to claim all of Oregon up to the 54°40′ line, and saw the compromise at the 49th parallel as a betrayal of their expansionist goals.

Which Political Faction Was Most Upset When the United States