"Donald Trump suggested in an interview that [Andrew Jackson was alive and well at the onset of the American Civil War]"

Oh Please!  This is what Trump actually said, "Had Andrew Jackson been a little bit later, you wouldn’t have had the Civil War."  Inasmuch as President Jackson had averted an earlier insurrection by South Carolina during the "Nullification Crisis" in 1832 (by mobilizing a full division plus 5 regiments under General Winfield Scott) and declaring, "Our Federal Union: It must be preserved”, it's an entirely reasonable statement.  Jackson had a well-deserved reputation for backing up his rhetoric with actions.  Lincoln (who followed the feckless  Buchanan) was as yet untested.

It seems that it's DAVID SHRIBMAN who "don't know much about history."