Now — if one can maintain civility, I open the floor to a question I asked my Jacobite friend, which I think is one worth asking (and please do not fight the Jacobite Wars over again here — that is not my point — nor ought you to assert the superiority of the American republic! Please just follow along). As we know, George III absolved his American subjects of their allegiance to the Crown with the treaty of Paris in 1783 — from which dates the de jure independence of these united States. Now the Jacobites did not accept the Union of Parliaments of 1707, because for them, it was an action approved by the usurper, Queen Anne, and not by James III. Obviously Charles III was not a party to the treaty of Paris. Now, presumably, if a closer heir of the Stuarts than the current Royal Family once again occupied the Throne, both the 1707 and 1800 Acts of Union, the independence of the American colonies, and indeed, the 1922 partition of Ireland and the Statute of Westminster would not be recognised by said heir (although one can easily suppose that they might soon be officially recognised out of necessity). For my Jacobite friends, what think ye of all of this?Right, and before the Acts of Union (whence the British flag, the Union Flag/Jack) you had England and Wales, Scotland, and Ireland as separate countries that happened to have the same king, sort of like the setup today with the dominions (so Elizabeth II is the Queen of Canada, etc.).
Anyway, practically speaking, probably not. But fun to think about. (Better still: undo World War I.)
If a Stuart monarch claimed Ireland or America, what could he do about it now?
By the way, the church has never been synonymous with Irish republicanism, American St. Patrick's Day notwithstanding with well-meaning American Catholics giving money to the IRA "cause." Early Irish nationalists were Protestants; later ones Marxists. The Popes would have loved to help Catholic Ireland with a top-down solution, hierarchy being the natural way, by having a Catholic British king such as the revert Stuarts bring all those kingdoms back into the church at once. Sort of like how we'd like to bring all the Orthodox back into the church at the same time.
Since the empire in its old form is done (and has been since World War I ran Britain broke, and which its elite were already preparing for secretly with Americans), with its real capital now Washington (obvious since World War II), is the question moot, sort of like Taiwan legally being Nationalist China?