The U.S.A. government policy and the Taiwan Relation Act ( 1979 )

                            The Taiwan Relation Act  authorizes de  facto  diplomatic relation  with  the  governing authorities on  Taiwan by  giving  special  powers to  the  American  Institute  in  Taiwan  to  the  level  that ,
it is the  de  facto  embassy .
                        According to   the  three  joint  communiques were  signed  in 1972,1979, and 1982 , the  U.S.A.  government  and  the  P.R.C. government  have  started   the  diplomatic  relation   to  recognize
 as  state  to  state  communication .
                  In July 2007 congreesional research  service report confirmed that  the  US  policy has  not  recognized the  P.R.C's  sovereignty  over  Taiwan . But  the  U.S.A  has  recognized  the  government  of 
the  P.R.C as  the  legal  government  of  China  and  it acknowledges the  chinese  position  that  is but  one
 China  and Taiwan is  part  of China .
                     In  2011, only  23  states offcially recognized  the   R.O.C  government ,  
According   to  the    U.N  general  assembly  resolution    2758  in  1971,  the  PRC  has    become   the
successor  government  to  the  ROC in  represending  China   and  seats in  all   the   UN  organs  had  been  previously  held  by  the  ROC  .  
               Examined  with the  UN  general  assembly resolusion  505 ,passed  on  February  1952  ,considered  the  PRC  government  to  be  rebel  against  the  ROC.