Without necessarily calling into question the facts presented in that Wikipedia entry, I do get the sense that it was in some degree edited by folks who don’t exactly love America, and might prefer that we give certain formerly Mexican territories back.
Wikipedia entry,
My current perception of the times with that there was a lot of power playing going on between the south and north. Slavery was part of the issue and the visible issue. There was much moral objection to slavery but also power and practical aspects. Nothing is pure.
It appears the democrats wanted land expansion and the Whigs more technology?
Lots of power players influence ; railroad, steamboat, etc.
Lots of change which destabilizes everything. Very complicated times and very similar to today............
If we follow this model maybe I should place another order with cheaper than dirt.