"When Abraham Lincoln was assassinated and Vice-President Andrew Johnson became 'the Accidental President,' it was a dangerous time in America. Congress was divided over how the Union should be reunited: when and how the secessionist South should regain full status, whether former Confederates should be punished, and when and whether black men should be given the vote. Devastated by war and resorting to violence, many white Southerners hoped to restore...