City A Base would not force Center Base to become part of them.
After all, the people in Center Base had also worked hard to maintain the base and made it a livable place. Even if there were some lacking, but it was still pretty good in overall.
Besides, the rest of the people who had no work then moved to City A Base and competed for various job opening.
The problem was that price increased.
These big mutated animals still appeared in large number and with the larger City A Base, they had to pay attention to larger area. Thus, there were more and more big mutated animals coming to an area not far from City A Base.
In order to make sure these big mutated animals would not attack them, they had to be killed first.
It would be too much for the military to manage such a large area.
And they also couldn't afford to expand the military too much because the resources would be too large.