If any southerner had been elected in 1860 there would have been no secession. The election of Lincoln threw the south into a "Lincolns going to take your slaves" panic
close, but not quite 100% accurate
the real issue was whether or not the practice of slavery would be allowed into new lands as the US expanded it's territories
many "historians" (presumably intelligent, from places like Yale) have chimed in that "Trump was wrong" & that Jackson could not have prevented the War Between the States because the war was "all about slavery"
they are wrong - revisionist history is fun and all, but Andrew Jackson used the might of the federal government to quash succession well before the War Between the States
and Jackson was no abolitionist, not by a long shot
it's worth noting that slavery existed just about everywhere & the world & ended without wars as bloody as the one fought here in the US
slavery in the USA would have ended with or without the war & would have ended even if the South had won the war
had we settled the slavery issue peacefully, we'd be far better off as a country for it today
the secessionist movement had been around for a long time - most people don't realize this & many historians whitewash the other factors that contributed to causing that war
whether you like it or not, Trump's statements were not unreasonable & a credible argument can be made that he is correct here