It wasn't before the French Revolution. A lot of it came about during and through the French Revolution.
I don't have the references for Thomas Jefferson handy at the moment. I'm sure it wouldn't be that hard to track something down, as there's a lot of discussion about that one on the internet.
As for George Washington and James Madison, I gave references in the first post I made on them:
http://www.freerepublic.com/focus/bloggers/2994252/posts?page=103#103
Interestingly, the 1825 book that I reference discusses owing allegiance, at least in the case of Thomas Paine, who was the main topic of discussion. It says yes, he had allegiance to France, but that was subservient to his allegiance to the United States.
Thanks. I still haven’t seen any proof that Jefferson, Washington or Madison “accepted” any French award of citizenship.
Chad might decide to declare that you or I are citizens, but that doesn’t, nor should it, have any bearing on our citizenship status in America. Now if I move to Chad or give open signals of allegiance to that glorious land, it still wouldn’t change my legal status, but my fellow American citizens would have good reason to suspect me of dual loyalties.