Version 7
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- Fixed a lot of issues with Vassalage
- Tweaked Warmonger evaluation
- Adding new AI messages to player
- Fixed long-standing bugs with Share Opinion
- Polished lots of features.

Version 6
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- New Vassalage system (see Civilopedia for details)
- Added Game Option "Disable Vassalage" (disabled by default)
- Added Game Option "Enable Human Vassalage" (disabled by default)
- Fixed all existing bugs with Share Opinion
- AIs that are Friendly and your Ally (hidden opinion) will now give you more information (deceptive, planning war) during Share Opinion
- Map tiles that aren't unique (more civs can see that tile) will lower the cost of that tile when evaluating world map value

Version 5
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Due to an unresolved issue, Version 5 will break existing saved games.

• Updates to Technology Trading AI valuation to make them cheaper and smarter
  
• Updates to Map Trading AI valuation to make them cheaper and smarter
  
• Porcelain Tower and Scientific Revolution now provide 25% Science generation and 25% discount on Tech purchases, respectively, if Tech Trading is active.
  
• Team games logic changes: Can't sell Friendly AI's technology or Maps, and they will always be Friendly towards you.
  
• Can request help from civs you have a Declaration of Friendship with, for no diplomatic penalty.
  
• AI civs whom you have a Declaration of Friendship with will occassionally offer you help if you need it.

Version 4
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Gameplay:
- Technology Trade is now available!
- Enable Technology Trading in Advanced Options.
- Technologies are evaluated based on their cost and their benefits - technologies like Astronomy and Education will be worth more than other technologies
- Note, at this time, technologies that modify yields (such as Civil Service, Fertilizer, and others) will not increase technology cost.
- You may sell your technologies after discovering Education. Both civs will need to have researched Education to enable one-to-one tech trading.
- Navigation now enables the sale of World Maps, not their purchase. Civilizations who research Navigation first will now have the advantage of being able to sell their maps to foreign civs first.

Bug Fixes:
- An issue with Sharing Opinions occured when the AI was hiding their opinion while at war. This resulted in them saying they were Friendly when actually at war. This has been addressed.
- Civilizations who are planning to go to war with another civ will still hide their opinion (show Friendly, Hostile, Guarded, or Neutral), and civilizations that are at war should now show (AT WAR!)

Version 3
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Bugfixes
- Saved Games should no longer crash upon loading

Version 2
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New Features:
- Map Trading
- Upon discovery of Navigation, you may purchase World Maps from other civilizations.
- The value of a World Map depends on the value of the unique land the map provides.
- Natural Wonders are worth 5x more than regular tiles.
- Resources are worth 2x more than regular tiles.
- Oceans/Mountains/Snow are worth 1/2 of regular tiles.
- In general, all tiles are 2 Gold, so Natural Wonders are 10 gold, Resources are 4 gold, Grassland, Coast, Desert, Tundra, and Plains are 2 gold, and Snow, Mountains, and Oceans are 1 gold.
- Trading World Maps requires an embassy in the seller's capital.

Bug Fixes:
- The AI should no longer hide their true feelings when sharing opinions (only affected war states).

Notes:
- This mod is fully modular, so if you'd like to change what tech certain things are, modify my XML!

Version 1
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Sharing Opinion - ask AI to share their opinion of another civ