Lincoln–Douglas debates

The Lincoln–Douglas Debates of 1858 (also known as The Great Debates of 1858) were a series of seven debates between Abraham Lincoln, the Republican candidate for the United States Senate from Illinois, and incumbent Senator Stephen Douglas, the Democratic Party candidate. At the time, U.S. senators were elected by state legislatures; thus Lincoln and Douglas were trying for their respective parties to win control of the Illinois legislature. The debates previewed the issues that Lincoln would face in the aftermath of his victory in the 1860 presidential election. Although Illinois was a free state, the main issue discussed in all seven debates was slavery in the United States.

In agreeing to the official debates, Lincoln and Douglas decided to hold one debate in each of the nine congressional districts in Illinois. Because both had already spoken in two—Springfield and Chicago—within a day of each other, they decided that their "joint appearances" would be held only in the remaining seven districts.

The debates were held in seven towns in the state of Illinois:

The debates in Freeport, Quincy and Alton drew especially large numbers of people from neighboring states, as the issue of slavery was of monumental importance to citizens across the nation. Newspaper coverage of the debates was intense. Major papers from Chicago sent stenographers to create complete texts of each debate, which newspapers across the United States reprinted in full, with some partisan edits. Newspapers that supported Douglas edited his speeches to remove any errors made by the stenographers and to correct grammatical errors, while they left Lincoln's speeches in the rough form in which they had been transcribed. In the same way, pro-Lincoln papers edited Lincoln's speeches, but left the Douglas texts as reported.

...
Wikipedia