Two financial crises at the ‘sub federal’ are currently taking place – one in the Commonwealth of Puerto Rico, and the second one in Greece. This column highlights some surprising similarities between them, as well as the main differences. The Eurozone is a voluntary union of states which remain sovereign. But if Greece were part of the US, it could not hold a referendum, and its budget would be drawn up by a federal bankruptcy court. The key political difference is not austerity, but the fact that Greece’s debt is mainly to official creditors, who are ideal targets for political pressure.