The Government of X-Roleplay is in charge of all of San Andreas.
Due to the abandoned cities, the Government has kept focus only on Red County and thus has it's current presence there.
You can read more about Red County's history here.
The country of San Andreas has it's own laws and acts.
Every President and it's party(government) have the 'right to rule' for three IRL months. The President is in control of the active laws and acts and has the right to suspend or issue new edicts at any time. The President of San Andreas can select a constitution during the elections times.
The official government building is located in: Montgomery