AHC: Bourbon union between France and Spain with POD after 1750

Your challenge is to have France and Spain united under a single Bourbon monarch by 1900 with a POD before 1750. I'm aware this is a tricky challenge, so feel free to have multiple PODs early and liberal use of butterflies to stop the British from interfering or any other changes needed.
 
Your titre ways after 1750, which would never work.

The best would be in the 15th century.

Firstly, have the Anjou get the throne of Aragon. You'll have it go to the elder Valois holding the royal crown of France a few generations later.


Then have a marriage with the Beltraneja, lawful heir of Castile of with Isabella the catholic, and, for example, the future Louis XII.

Then come the Bourbons. The best would be to have the Valois-Angoulème die out before reaching the throne since Francis I was a bad ruler.
 
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