FREDERIC J. BROWN/AFP via Getty Images
- Donald Trump said that the Civil War could have been negotiated.
- He said that he believed Abraham Lincoln could have done more to avoid violence.
- A Yale history professor said the comments were "elementary school nonsense."
Former President Donald Trump declared that the Civil War, which was primarily fought over the issue of slavery, could have been negotiated.
"The Civil War was so fascinating, so horrible — but so fascinating," Trump said at a campaign event on Saturday.