In this case, enlightenment techs + infrastructure (roads). I doubt the port added anything, as it was damaged. France always gives priority to enlightenment techs, so I wouldn't be surprised if it had all of them by 1730. That adds a lot to town wealth all by itself. ~ 50/turn IIRC.
So I guess it took France longer to finish the enlightenment tech tree... (or it would have been in excess of 6K by 1790).
PS: Just booted up ETW. Without secularism & abolition, my enlightenment bonus at 1751 was 77 / turn.
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