If this scenario occured, is there any way Frémont could've pulled out a victory? Or even perhaps Fillmore?
No. The house would stick with the Democrats. Fremont would break the Union and if he was chosen we’d see secession earlier in history, which everyone wanted to avoid. The Know Nothings didn’t have enough support so Buchanan would still win because he’d delay the inevitable Civil War.
If this scenario occured, is there any way Frémont could've pulled out a victory? Or even perhaps Fillmore?
Why would the South secede if Breckinridge is President? They have no reason to in that situation.I think Breckinridge becoming President is one of the under used, but most likely ways the South secedes successfully.