Trump on Civil War: Why couldn't they have worked that out?

The U.S. president had a historical question: Why did America's Civil War happen? "Why could that one not have been worked out?"Remarks by Donald Trump, aired Monday, showed presidential uncertainty about the origin and necessity of the Civil War, a defining event in U.S. history with slavery at its core. Trump also declared that President Andrew Jackson was angry about "what was happening" with regard to the war, which started 16 years after his death, and could have stopped it if still in off