One interesting feature was that before the Weimar Republic, France was the only country in Europe that was NOT a constitutional monarchy or at.least halfway constitutional empire. And what's more, France seemed to do actually pretty good, see Belle Epoche, Fin de Siecle and such... Internationally, France was the odd one out, the one country where those late 1700's experiments in kingless democracy actually worked. Well, across.the ocean.you had the USA off course, but that was a completely different universe with Indian Frontiers, goldrushes, slavery and such... Not really what would work in Civilized Europe.
So if there was a French kingdom, common wisdom would be that - at least in Europe- you need a king or queen as head of state for democracy to really work. This would have tremendous implications ranging from the rise of socialism and communism to the politics in the new South American countries (Brazil remains a monarchy, Santa Anna crowns himself King of Mexico...), even all the way down to the collapse of the German empire in 1918/1919 and then on to the fate of the former European colonies after WWII.
Hell, even WWII might butterfly itself away
So if there was a French kingdom, common wisdom would be that - at least in Europe- you need a king or queen as head of state for democracy to really work. This would have tremendous implications ranging from the rise of socialism and communism to the politics in the new South American countries (Brazil remains a monarchy, Santa Anna crowns himself King of Mexico...), even all the way down to the collapse of the German empire in 1918/1919 and then on to the fate of the former European colonies after WWII.
Hell, even WWII might butterfly itself away