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22nd century

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2170 was a year in the 2170s in the 22nd century.



  • The Callisto Treaty is signed. The Frieden and Koslovics formally surrender to the UNSC, officially ending the Interplanetary War. With this treaty the Unified Earth Government becomes a full-fledged governing entity in the wake of the conflicts.[1] Now, the victors are forced to deal with a less obvious but equally serious threat: overpopulation and a massive military with no enemy to fight. Overpopulation caused by massive population surges in the post-war period, combined with the destruction and famine bred by the Rain Forest Wars, threaten to destabilize the economy in the coming years.[2]


  1. ^ Halo Mythos, Rise of Humanity, The Interplanetary War (p. 51)
  2. ^ The Halo Timeline (defunct, Archived)