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22nd century

Years in the 2170s
2170 • 2171 • 2172 • 2173 • 2174
2175 • 2176 • 2177 • 2178 • 2179

For a complete list, see our timeline category.

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][3]


  1. ^ Halo Mythos - Rise of Humanity - The Interplanetary War, page 51
  2. ^ - Halo: Combat Evolved, Game Features, Story Line (Retrieved on Nov 7, 2008) [local archive] [external archive]
  3. ^ Halo Encyclopedia (2009 edition) - Chapter Two: Humans - Human Colonization of Space, page 42