The Altera Centauri collection has been brought up to date by Darsnan. It comprises every decent scenario he's been able to find anywhere on the web, going back over 20 years.
25 themes/skins/styles are now available to members. Check the select drop-down at the bottom-left of each page.
Call To Power 2 Cradle 3+ mod in progress: https://apolyton.net/forum/other-games/call-to-power-2/ctp2-creation/9437883-making-cradle-3-fully-compatible-with-the-apolyton-edition
It is a function of their traits. Religious civs may trigger one for Bach or Sistine. Some like China have civ related wonders of the great Wall, Egypt and the Pyramids.
Each wonder (see civlipedia) tells you what traits it can impact.
I don't have a list perse.
Had you captured any wonders? A fragment of a memory tells me that if you captured wonders that fulfilled your traits in combination with your existing wonders, then the next wonder you build will trigger your GA. Ie as America building an expansionist wonder and then capturing an industrious one like the great wall. The next wonder would trigger your GA regardless of its traits.
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