After taking a city in foreign territory, I often find that I have just the land the city resides on to harvest. In the attached screenshots, you will see a prime example:
The first shows the available locations to harvest from inside the city screen, the second the overhead view.
The third and fourth illustrate an experiment I tried - sending some troops out to destroy the 'enemy structures' and sit on the land... no change. If I remember correctly, simply putting the unit on the enemy box in early versions of Civ would ownership of that spot to you.
Can someone please explain this to me?
Thanks,
Matt
PS. I am new at this (haven't played for YEARS), but learning quickly again...