AH Challenge: Monarchy Wank

Ok So try to create a world where most European countries and some American countries (Mexico, Brazil, etc) have monarchs on the throne. Constitutional, absoute, or enlightened monarchs are all welcome for the purposes for this challenge. Try to keep most European states apart and bonus points for placing historic royal houses on their respective thrones.
 
I doubt if it's possible to do 1900, but I've got some ideas. Mainly, it was the constitutional monarchies, with relatively weak monarchs that held out, while absolute monarchies or monarchs that acted like they were in one ended up abolished etc.
Make the monarchs less powerfull, and do so earlier (preferably before 1900), and you might end up with a Tsarist Russia and a German Empire up to present day.

Though, ofcourse, in the end it's all up to the monarch, I guess.
 
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