If you´re attempting a culture victory, stay at 4, rather even 3 cities since costs for cultural policies (CPs) scale with the number of your cities.
You can still "puppet" AI cities. They will provide you with culture and other benefits - though will also cost maintenance and have an impact on happiness - but they won´t increase costs for CPs.
You can still "puppet" AI cities. They will provide you with culture and other benefits - though will also cost maintenance and have an impact on happiness - but they won´t increase costs for CPs.
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