History Prof. Michael Birkner was quoted in a July 1 BBC article about James Buchanan's presidency.
From the BBC:
Civil War was inevitable, says Birkner, professor of history at Gettysburg College. But the blunders of politicians like Buchanan - and Kansas was his biggest - made it happen sooner.
Lincoln, whose election triggered the break-up of the Union, would not have been elected if Buchanan had not split his own party, he adds. But Andrew Johnson, who followed Lincoln, was a worse president than Buchanan, Birkner says, because he squandered the opportunity to take the country forward after the war.