The best replacement for federation is confederation.

The best alternatives to federation are rated as following:
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★★★  zeon
★★  republic
★★  empire
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★  dominion
★  sso
★  borg
★  sharding
  romulans
  klingons
  klingon
  unitary state
  russia
  klingon sto
  world wildlife fund

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Speaking about federation, one probably shouldn't forget about lync online.

Other search terms related to federation and their ratings are:
★★★★★ lync online
★ australia
★ federalism
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