He didn't provide evidence, but called people in to give testimony before congress
The legislative branch makes laws, the judicial branch interprets laws, the executive branch enforces laws
Two issues that arose in the convention of Philadelphia were due to slavery, and whether or not slaves should be considered a part of the total population. The three fifths compromise counted them as 3/5 of a person for the purposes of determining a state's level of taxation and representation.
Isn't it the study of how you interpret a language and/or speak it?