What did james polk mean when he declared “fifty-four forty or fight! ” in the 1844 presidential campaign? did he follow through with this campaign promise? explain.

He meant that under his administration, the US would accept a boundary between the US and British portions of the Oregon Territory no further south than the fifty-four forty line of latitude, or he would go to war with Britain. He did not deliver on this promise as the US/Britain boundary in the Oregon Territory was set further south than the fifty-four forty line without a war between the two nations.