Questions and Answers about City Bonuses and Cancel City Units

FLAVORS OF CITY TERRAIN AND THEIR CITY BONUSES:

Player-owned cities able to produce 3 or 4 units......+2
Player-owned cities able to produce 0,1, or 2 units...+1
Neutral cities able to produce 3 or 4 units...........+1
Neutral cities able to produce 0,1, or 2 units........+0
Razed cities..........................................+0
Ruins.................................................+2
Strongholds...........................................+2
Temples...............................................+2
Towers................................................+1


QUESTIONS AND ANSWERS:

>Why does a neutral city have a different bonus than an enemy city?

Neutral cities have their defensive bonus halved, and rounded down.

>Why does an enemy city with no production still get a +1 bonus?

We like to imagine that the city walls are still standing and therefore
the city's fortifications still provide extra defense.

>Why does a razed city not get a +1 bonus?

We like to imagine that there's nothing left but burned-out rubble, 
so there are no fortifications.