And like many social science "theories" it's entirely incongruous with reality. One counter-example suffices to disprove a universal claim.
The United States is that exception, because our constitution explicitly recognizes, not grants, our right to arm ourselves independently of the State (or States really), only with some regulation permitted.
The actual definition of State can easily be found in the dictionary: "a nation or territory considered as an organized political community under one government."
