No Title of Nobility shall be granted by the United States
Our founders hoped to protect America from dynastic rulers when they prohibited the Federal government from granting titles of nobility. I believe that this prohibition is why the dynasties that we have seen—Kennedy, Clinton, and Bush, for example—bother us as Americans.
I think we have unwittingly evolved a new noble class. "Congressman", "Representative", and "Senator" have become the equivalent of Titles of Nobility especially in light of the pension perks that allow these modern nobles to collect revenues on their titular properties from tax paying serfs.