Europe never really experienced democracy until after WW2.But they kept the royals, too. And for some, they kept the cousins of the buzzards that brought about both WW1 and WW2. So all bloodfeuds never were resolved. AND THEN CAME THE LOVELY EU!!
Where all the penny ante dictators who did not make rank at the UN, have now done so!
And yes, the tsarist//communist//CIS russia is still waiting outside the fence!
The majority of European countries are Republics, not monarchies. The British, Dutch and Spainards, maybe some Nordic countries, too, kept their queens/kings, but not the rest.