oregon boundary dispute

To my (limited) understanding the Abolition question was getting pretty heated before Polk's expansionist policies got both Southerners and Northerners to rally around the flag. If (moderate***) abolitionist and anti-expansionist Henry Clay wins the Presidency, is an early civil war likely...

What if there was an earlier solution of the Oregon boundary dispute? In 1818, in a last-ditch effort to avoid joint occupation, Gallatin and Rush offered the British the Gulf of Georgia and the territory that it drained. This would have awarded "all the territory draining west from the Cascade...