Evaluating the information found in abraham lincoln's first inaugural address and thomas cobb's letter would allow a historian to accurately make which of the following conclusions about the pre–civil war united states? a. southern leaders underestimated republicans' eagerness to end slavery in the united states as quickly as possible. b. both democrats and republicans realized that the election of abraham lincoln would inevitably lead to civil war. c. northerners and southerners had very different impressions of the relationship between the two regions. d. northern leaders believed that only military force could prevent the south from seceding from the union.