se·ces·sion·ist /-ˈsɛʃ(ə)nɪst/
  分離主義者
  Se·ces·sion·ist, n.
  1. One who upholds secession.
  2. U.S. Hist. One who holds to the belief that a State has the right to separate from the Union at its will.
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  secessionist
       n : an advocate of secessionism