Border issue on North-West coast with US and Britain.
Lots of people wanted Oregon's boundary to be at 54 degrees, 40 minutes (about the southern boundary of today's Alaska) and were willing to fight Britain for it.
Not actually a campaign slogan in 1844, but often misinterpreted as one. James Polk got elected that year on this ideal, but eventually ended up settling on the 49th parallel-- without fighting. This border is still used today.
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