The best replacement for nations is united nations.

The best alternatives to nations are rated as following:
★★★★★  united nations
★★★★  states
★★★★  league of nations
★★★  countries
★★★  age of empires
★★★  through the ages
★★  empire earth
★★  aboriginal
★★  catholic church
★★  developed nations
★★  nato
★  nation's
★  un
★  civilization
★  inuit
★  reservations
★  european union
★  tweed
★  native american
★  companies
★  red scorpions
★  large nations
★  tribes
  poor nations
  vatican
  developing nations
  warcraft 3
  europeans
  age of empires 3
  rise of legends
  total war
  pacific northwest tribes
  communist manifesto
  victoria 2
  caledonia
  peripheral nations

Your alternative for nations is not listed? Suggest!
Speaking about nations, one probably shouldn't forget about armies.

Other search terms related to nations and their ratings are:
★★★★★ armies
★★★ nuclear power
★ democracy
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Google Trends

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nations
united nations
states