1.) Better roads
2.) Tracks si it was better to navigate
3) The agrarian radicalism was a realistic response. The farmers had a right to be afraid. 4) It was to focus on the issue of free silver a betrayal of agrarian ideals.
The three-fifths compromise was basically congress deeming that a slave was three fifths of a person. So I do believe that it is the first one: States representation in congress based on slave population