When "Fifty-four forty or fight" did not result in gaining all of the Pacific Northwest, who most likely would have been the angriest?

Question

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Northern Democrats were the most ardent supporters of the "Fifty-four forty or fight" slogan, which advocated for the expansion of the United States territory up to the latitude of 54°40′ north in the Oregon Territory dispute with Great Britain. They would have been the angriest at not achieving this goal, as it represented a compromise rather than the full territorial claim they sought.

When "Fifty-Four Forty or Fight" Did Not Result in Gaining