Claim: Japan is represented by one centralized federal government.
Evidence: Japan -LRB- 日本 Nippon -LSB- ɲip̚poɴ -RSB- or Nihon -LSB- ɲihoɴ -RSB- formally or Nihon-koku , meaning `` State of Japan '' -RRB- is a sovereign island nation in East Asia.
A sovereign state is , in international law , a nonphysical juridical entity that is represented by one centralized government that has sovereignty over a geographic area.