Even Walt knew that. The show was designed with the ideals of America and our goals. It touches on how grateful we can be that Washington did not want to be a king just as our country did not want to be founded on a return to that.
It touches on lincoln because it is the difficult, and arguably still the most difficult time and situation a President could ever face, a house divided. It is the formed system of executive branch and the Civil War. Just elaborating on what you said. The show does that very well.