Either slavery or the nation had to perish. In history classes now-a-days we are told, Abraham Lincoln rose to the presidency and took the needed steps to end the intolerable situation of segregation by making sure that the South did not withdraw from the Union and remain a slave-holding society. Does he really deserve all this credit? This used to seem a plausible story to me. Most people are quite satisfied with the ending, hoping that, in time, effects of slavery and segregation would vanish and the country would emerge supportive of individual rights for all. Yet, there were some diff…