Originally Posted by
Smokey_MkII
The AI, somewhat sensibly, won't accept territories under the following conditions.
1) province is occupied by an enemy force - no one wants a territory they can't defend against an army that will soon march on the capital
2) province's ports are occupied (blockaded) by enemy ships
3) province is in a state of unrest
4) province was conquered this turn
if anyone knows of any other conditions, please add.
The solution is ensure stability and expel all land and sea threats before you try to foist the province on anyone. And don't loot provinces you want to give away.