AHC: Presidential Personal Union

At any time (pre-1900 is OK) your challenge is to have two countries with republican/democratic forms of government in personal union, meaning they share a president, dictator, prime minister, etc. Heads of State is fine, but bonus points if its actually heads of government.

For instance, the United Arab Republic was an actual political union, but it could have been a personal union with the right breaks. Syria remains a separate country, but Nasser is the new President of Syria.

What would really be interesting is if this kind of maneuver became a recognized response by an alliance that was facing extreme levels of threat: as an emergency measure, pick one of the countries' ruler to be in charge for all countries in the alliance for a year.

Apologies if something like this has been posted already. My search did not turn up anything.
 
The president of France is also one of the two ruling monarchs of Andorra. While the two monarchs are unelected(at least by Andorrans), the country itself functions as a democracy.
 

Mobiyuz

Banned
The short story "Vilcabamba" has a situation where the President of the United States is also the Prime Minister of Canada, although in the story aliens have invaded and subjugated Earth very easily and both nations are reduced to a stretch of land in the Rocky Mountains.
 
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