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  In Winters v.                 United States             (1908), the Supreme Court held             that the right to use waters flow-      Line             ing through or adjacent to the        (5)      Fort                 Berthold Indian Reservation      was reserved to American Indians      by the treaty establishing the res-      ervation.  Although this treaty did      not mention water rights, the Court       (10)     ruled that the federal government,      when it created the reservation,      intended to deal fairly with      American Indians by preserving      for them the waters without which       (15)      their lands would have been use-      less.  Later decisions, citing      Winters, established that courts      can find federal rights to reserve      water for particular purposes if       (20)      (1) the land in question lies within             an enclave under exclusive federal             jurisdiction, (2) the land has been      formally withdrawn from federal      public lands — i.e., withdrawn from       (25)     the stock of federal lands avail-      able for private use under federal      land use laws — and set aside or      reserved, and (3) the circum-      stances reveal the government       (30)      intended to reserve water as well      as land when establishing the      reservation.                   Some American Indian tribes      have also established water rights       (35)      through the courts based on their      traditional diversion and use of      certain waters prior to the United      States’ acquisition of sovereignty.      For example, the Rio Grande       (40)      pueblos already existed when the      United States acquired sovereignty      over New Mexico in 1848.  Although      they at that time became part of the      United States, the pueblo lands        (45)      never formally constituted a part      of federal public lands; in any      event, no treaty, statute, or exec-      utive order has ever designated      or withdrawn the pueblos from       (50)      public lands as American Indian      reservations.  This fact, how-      ever, has not barred application      of the Winters doctrine.                  What      constitutes an American Indian       (55)     reservation is a question of      practice, not of legal definition,      and the pueblos have always      been treated as reservations by      the United States.  This pragmatic       (60)     approach is buttressed by Arizona      v. California             (1963), wherein the      Supreme Court indicated that the      manner in which any type of federal      reservation is created does not       (65)     affect the application to it of the      Winters doctrine.  Therefore, the      reserved water rights of Pueblo      Indians have priority over other      citizens’ water rights as of 1848,       (70)     the year in which pueblos must      be considered to have become      reservations. 
 
 The primary purpose of the passage is to                                               - trace the development of laws establishing American Indian
      reservations              - explain the legal bases for the water rights of American Indian
      tribes              - question the legal criteria often used to determine the water
      rights of American Indian tribes              - discuss evidence establishing the earliest date at which the
      federal government recognized the water rights of American Indians              - point out a legal distinction between different types of
      American Indian reservations 
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