Well then something is critically broken since they don't have copper and thus they can't build resource factories and power plants (Copper wires are needed to build power lines needed to build power plants needed to build resource factories and a lot of Industrial and later era stuff).They probly do eventually just not as high priority as other tasks. If they need the resource they should make it a higher.
I found like at lest 5 unimproved resources if not more outside of vicinity but within borders.
Improving resources should be absolutely highest priority, if they don't have them yet.
Setting resources at 200% of density before generating map fixes that issue, because they improve resources within vicinity without problems at least after Prehistoric era.
That is important resources are 2x more often within vicinity.
I uploaded save earlier, so you could see that they really don't want to improve stuff outside vicinity.
I disabled traits completely in my tests to shut their influence on expansion.
I think leaders have their personality defined somewhere, as some expands more than others.
It is bit weird, that Nightmare AIs don't cover whole Tiny Pangaea (84x56) map (C2C_World map script) by 200th turn.
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