As a Whig I reject Manifest Destiny in favor of building up the lands we already occupy, especially not to free up more land in the South for Southern slavers to expand their peculiar institution into. The Davis compromise gives any new state below the line of compromise an entitlement to hold its own vote on the matter, and we all know how slaveocratic guerrillas tend to influence events and overturn laws they dislike, just as in Texas. Just as the Texans and the SNP held that it was not truly nullification as Texas was not yet a member of the US (and thus could theoretically choose how it wants to enter the union), any territory we released would just be taken over by settlers who would threaten to form their own new republics should we try to enforce legitimate federal laws upon them. And any referendum in such territories would be a joke - despite being a distinct minority, slaveocrats have peculiar notions about democracy being more about gunplay than ballot boxes. If Texas was willing to use arms to resist a federal law,that means any Southern influenced territory would be perfectly willing to kill its own freesoil minded residents should the anti-slavery vote outweigh the pro-slavery vote. So the very idea of these referendums is a joke, the South and the SNP would never allow a democratic majority to enforce anti-slavery laws anywhere South of the line of compromise.
This is why we should not war with Mexico and should not entertain Manifest Destiny - Manifest Destiny is the crux of Jacksonianism, and as Whigs were we not so long ago formed as a coalition specifically AGAINST "King Andrew" ?
This is the folly of National Unionism. I helped Cameron get elected, but I'll be damned if I don't go out of this mortal coil like a Whig.
Nay, Nay, forever Nay!