Quick question about a bit of oddness. In my last game, the computer would not let me build the Apollo Program in my most productive city, but would let me build it in another, nearly identical city (i.e., about the same size, same number of improvements, etc.). The only difference I could see between the two cities was that the one I could build in was one I had founded, while the one I couldn't build in was one I had conquered (though it wasn't in resistance or disorder). So: is there some restriction of building the Apollo program that the Civilopedia and manual both neglect to mention?
TIA.
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