Hrm. The USA has many faults but being a single-party state is not one of them. What you describe however is true of any social structure. Vocal, highly engage

Hrm. The USA has many faults but being a single-party state is not one of them. What you describe however is true of any social structure. Vocal, highly engaged minorities dominate the discussion and thus steer normative process. The progression of the process is taken up by the silent majority and societies' overtone window is shifted. It takes another vocal, highly engaged minority to change the influence how the discourse shifts. As soon as the shift in overtone window is noticed by enough members of society, this minority finds together and the shift is halted.