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 likely to be angered by the failure to gain all of the Pacific Northwest, as they were strong supporters of expansionism and the slogan "Fifty-four forty or fight" represented their desire to claim the entire Oregon Territory up to the latitude of 54°40′.

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