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From Sonic Retro

The United Federation is effectively the U.S.A. of Sonic's world. Populated by humans, the Federation is led by a President who works from a building highly reminiscant of the American White House. G.U.N. appears to function as the Federation's military.

It is worth noting that the United Federation dosn't appear to be a 'World State'; in Sonic the Hedgehog (2006), Soleanna is strongly implied to be a wholly independent nation with its own monarchy. G.U.N. dosn't seem in too much of a rush to help the inhabitants of Monopole during Sonic Riders: Zero Gravity either.

Notable Locations

The United Federation capital, Central City, as seen in Sonic Battle.

• Central City (Capital)
  • Emerald Town, Night Babylon, Gimme Shelter (Sonic Battle)
  • City Escape, Mission Street, Radical Highway, Route 280, Route 101 (Sonic Adventure 2, although the city featured in that game is never explicitly named as Central City)
• Westopolis
  • Lethal Highway
• GUN Fortress
• Prison Island
  • Iron Gate, Metal Harbor, Prison Lane, Weapons Bed, Security Hall, White Jungle, Green Forest

The Space Colony ARK was also a United Federation project until it was shut down fifty years ago, though it now lies abandoned and inhabited by nothing but Artificial Chaos.