He remains one of the most controversial figures in American history. His uncompromising moral standards made him a lightning rod in an era fraught with conflict. Sumner's fight to end slavery made him a hero in the North and stirred outrage in the South. In what was called the first blow of the Civil War, he was physically attacked by a colleague on the Senate floor. Unwavering and arrogant, Sumner refused to abandon the moral high ground, even if doing so meant the onslaught of the nation's most destructive war. He used his office and influence to transform the United States during the most contentious and violent period in the nation's history.