Note that during the events of the Red Year (4E 5), the Argonians conquered southern Morrowind, but contrary to the map included by Ramirez, northern Morrowind still remains under the control of the remaining Great Houses of the Dunmer. To correct the implications of the map included with answer, I'm adding these maps that show the state of Morrowind based on available information during the events of Skyrim (Fourth Era).
