AHC: Post-1900 Royal Personal Union Between Two Major Powers

Just as the tin says, your challenge, if you choose to accept it, is to create a long-term personal union between two major royal powers, with your POD occurring on or after 00:00 1 January 1900.
 

Deleted member 90949

Have India continue to recognize Queen Elizabeth II as head of state.
 
If Tewodros II/Yohannes IV/Menelik II can manage the task of properly overcoming Ethiopia’s feudal hurdles and centralize, there’s always the chance that the Solomonic Dynasty intermarries into their counterparts in Japan. There were already proponents of a marriage between Araya Abebe and Kuroda Masako by the early ‘30s so should there not be too much interference from outside parties, a personal union could occur.
 
Due to Alexie's condition Russia changes its laws and Grand Duchess Olga Romanov is named second in line to the throne.
On a visit to Britain she meets David Prince of Wales, they fall madly in love and elope to Gretna Green. 7 months later she gives birth to a surprisingly heavy and healthy premature baby son.
 
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