For a century, the constitutional architecture of the British Isles has rested on arrangements forged through conflict and compromise — but that architecture is now under simultaneous pressure from within and without. Scotland, Wales, and Northern Ireland are advancing coordinated independence movements, while President Trump has publicly expressed his desire to see Ireland unified under a single government, breaking with longstanding American diplomatic neutrality. What was once dismissed as peripheral aspiration has become a matter of international consequence, raising the question of whethe