The first 3 games of S1 I have played were all on the 19-player map, and at the end of every day, morale in newly conquered provinces went up, as it always has in games of both S1914 and S1 in my experience when you have a big enough garrison to prevent uprisings.
But for the first time, I am playing on the 30-player map, and to my astonishment, on the new day all the morale in my newly conquered provinces has plummeted - to between 8% and 11% - so that instead of being able to reduce the size of my garrisons, I can't do so, in fact I am now having to increase some of them because their garrisons are no longer strong enough to prevent uprisings. Also, even in the provinces where I have made improvements, morale has either barely budged - from 50% to only 51%, for example, in a province where I built a vehicle factory - or has also decreased, from 50% to 49% in a province where I built a barracks.
Now if I had some clue as to why morale has plummeted across the board, I might be able to do something about it, but since there's no hint in the province morale tooltip, I have no idea what is causing it.
It might also be easier to stomach a harsh morale regime like this if you actually got a boost of morale the way you used to for conquering capitals - but this appears to no longer be a game feature, at least not in any of the games I have played, and not in this one either as I already conquered one capital and got no morale boost. But regardless, it's ruined my strategy, and I am now thinking of quitting the game because if your morale is just going to plummet turn after turn for no apparent reason, there is no hope of getting anywhere.