Best PODs for a united west-europe

That the the Frankish Empire stay united for a few generations more (the best way would be several kings with only one surviving son at his death) until at some point, it's agreed that the empire should stay united by Frankish Estates.
 
- Surviving Roman Empire in West.
- Carolingian Empire remain longer as unified nation.
- Succesful Napoleon.
- More federated EU.
 
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