This novel has no logic whatsoever. By chapter 20, the guy already has food production x100, military units x100, construction speed x100, weapon production x100, 3 insanely powerful units, a wonder that just so happen to match his talent, AND HE IS STILL BEHIND OTHERS!
And the war system is even more absurd. The one who start a war chooses the terrain... Why even try to build a defense when in a war you get teleported to a terrain where you'll be at a disadvantage?
That means any defense he constructs can only be used against monsters!
TLDR : dumb premise and illogical system