I am affraid, your right, it was my error, the campaign I played I never got to conquer any places that did not have them.
But I started a new campaign and this time I conquered Texas pueblo peoples and it never gave me defenses yet. Had an initial population of 6k, brought it up to 16k (with farm and fishery) and nothing.
So I am equally, curious now.
I did construct a Fort within City perimeter thought...I do not know if that could have influenced it.
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