[BroJoeK]

Smokin' Joe: "It would be folly to think that the Northern States did not recognize that abolition would have the same effect..."

In 1860, no Northern state -- none -- called for abolition of slavery in the South.
What Northerners then wished was to prevent slavery's expansion into western territories and even into Northern states themselves.

[Smokin' Joe]

There were slaves in Northern States already.