First ministers of Scotland, Wales, and Northern Ireland gather in Cardiff on September 14 to sign a joint declaration demanding the right to hold independence referendums and strengthen inter-nation cooperation.

Key takeaways:

1. John Swinney (SNP, Scotland), Rhun ap Iorwerth (Plaid Cymru, Wales), and Michelle O'Neill (Sinn Fein, Northern Ireland) gather for high-level political talks.

2. For the first time, all three devolved UK administrations are led simultaneously by pro-independence parties.

3. A joint declaration calls on Westminster to recognise each nation's right to choose its constitutional future through independence referendums.

4. Beyond constitutional issues, talks focus on joint strategy across energy, equitable public funding, and post-Brexit relations with Europe.

5. Current polling shows independence support at 47% in Scotland, 36% in Northern Ireland, and 32% in Wales.