For decades, the United Kingdom has been held together not only by law and institutions, but by an assumption: that despite political disagreements between its constituent nations, the union itself remained the stable framework within which those disagreements would be resolved.

That assumption is now being tested.

On September 14, political leaders from Scotland, Wales and Northern Ireland gathered in Cardiff and issued an unusually coordinated declaration asserting their nations’ right to determine their constitutional futures. Scotland’s John Swinney, Wales’s Rhun ap Iorwerth and Northern Ireland’s Michelle O’Neill, alongside Sinn Féin leader Mary Lou McDonald, used the occasion to demand that Westminster should not obstruct democratic efforts toward constitutional change.

The rhetoric was striking. The leaders declared that “Westminster’s time is coming to an end.”

That does not mean the United Kingdom is about to disappear. Nor does the Cardiff gathering provide a legal mechanism for breaking up the state. But it represents something politically significant: nationalist movements that have traditionally pursued separate constitutional agendas are increasingly presenting their arguments as part of a wider challenge to the Westminster-centered structure of Britain.

That is why Cardiff deserves attention.

A British echo of the Soviet collapse?

The comparison with the final days of the Soviet Union is tempting.

In 1991, leaders of several Soviet republics gathered to discuss a future beyond the existing union. The eventual Belovezha Accords formally declared that the Soviet Union had ceased to exist, with Russia itself participating in the process.

Cardiff was nothing like that in legal terms. England was not represented, Westminster did not participate, and the leaders involved were acting primarily as political party leaders rather than negotiating a binding treaty for the dissolution of the United Kingdom. The Cardiff gathering therefore should not be mistaken for a British version of Belovezha.

Yet the symbolism matters.

For the first time, political forces governing or leading major nationalist movements in Scotland, Wales and Northern Ireland have found a common political language around self-determination. Their constitutional destinations are different: Scottish independence, Welsh self-government or independence, and Irish reunification. But they increasingly share an argument that constitutional authority should not ultimately rest with Westminster alone.

That is a........

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