Population growth

Map world at war 100 players

I can't seem to find a decent amount of population growth...

It seems to me like the provinces that are not a native ones produces such a small amount of population that cannot sustain my overall economy.

For instance - It tends to be like the food is overall invaluable resource after day 10, mainly because there is not a single normal way to get your population to the point where it can sustain that military machine. On the other hand - steel is a resource that is crucial...

Any thoughts?