My total population is 1 Billion and 400 Million, if my maths does not fail me.
I found that there is almost no point at all to capture empty provinces, ones with no resources and just population in them, with 0 victory points.
I want to expand, out of necessity, but even if i did, my core provinces do not produce enough food, and any provinces i capture wont produce enough food to sustain themselves because morale is low.
taking only 25% resources from captured territory ... and controlling large territory even when not at war, still reduces morale globally over time, it does not increase, so i suffer from rebellions, unless forcibly, i have to invade other countries and capture their capitals asap to give my provinces a morale boost.
I dont see why the game at a late stage would want to force me to attack other capitals in a race of time to keep my overall morale high to sustain everything. Its like the game Forces you to remain in your little territory and extend the game as much as possible, unless you have gold to pump in your economy.
I dont understand why many provinces have 0 victory points in them, why would i bother capturing a Province that has 0 victory points and only more mouths to feed
I had to capture Ai capital 3 - 5 times to increase my morale and set my food production back to +50 for a brief period, untill next day, when it drops down to -300

One would think realistically, that after controlling this much territory, that at the very least, resources would quadruple. but, NOPE.