James Buchanan -and this forum seriously needs some historical perspective. As bad as some think President Bush is, I don't see him precipitating a civil war that took at least 2% of the population once it was finally concluded...
The civil war was started under the Lincoln administration. He could have just let the South leave in peace.
They had no right to secede, and Lincoln had to preserve the Union.
Why did Lincoln have to preserve the Union? I here this often, it's repeated as a central tenant of American history and yet it's based on nothing substantial. The South could have left without a full scale war being fought. Why was the Union so important?