One of the most significant and far-reaching events in U. S. history, the Lincoln-Douglas debates of 1858 sharpened and brought to a head a number of crucial questions concerning slavery, states' rights, the legal status of blacks, and the effects of the Dred Scott decision. The debates were held as part of the campaign for the Illinois senatorial seat, pitting the two-term incumbent, Democrat Stephen A. Douglas, against the lesser-known Abraham Lincoln,...