the U.S. Constitution wrote:
No title of nobility shall be granted by the United States: and no person holding any office of profit or trust under them, shall, without the consent of the Congress, accept of any present, emolument, office, or title, of any kind whatever, from any king, prince, or foreign state.
It's just a guideline, of course … not meant to be the law of the land or anything …
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"We are fast approaching the stage of the ultimate inversion: the stage where the government is free to do anything it pleases, while the citizens may act only by permission – which is the stage of the darkest periods of human history, the stage of rule by brute force." – Ayn Rand