Did it say where they got this "citizenship" idea?
No, it didn't, because Wikipedia is full of liars too.
They got the idea of "citizen" from Switzerland, where it's people were called "citizens."
In England, they were called "subjects." They were also called "subjects" in France, Germany, Spain, Poland, Italy, and in fact in *EVERY* nation on earth.
Do you know the only place in the world that used "Citizen"?
It was Switzerland. Switzerland alone used "citizen."
Now who do we know that describes this "citizen" thing, and comes from "Switzerland"?
I looked that up, not on Wikipedia, since that offends you.
All the dictionary sources I used trace it back to a combination of Latin (French) and early English.
Not one word on Switzerland origin.
You need to relax some.