People around the world continue to want a nation to call their own. There have been recent independence referendums in Kurdistan, Catalonia and Scotland. This trend has being going on for a century, as empires have given way to nation states, and those states have further subdivided. For much of the 20th century this made sense. Politics, the economy, and communications were mostly organised at a national scale. National governments had actual powers to manage modern economies. But after many decades of globalisation, have economies and information grown beyond the authority of national governments? How good are nation states at dealing with trans-national threats such as terrorism, migration or global warming? Carrie Gracie and a panel of expert guests discuss whether the nation state is in decline. And if so, what might replace it?