Thoughts on the Past, Present and Future of Diverse Democracies

What are the main threats to diverse societies and why is the timely recognition of these threats more important in liberal democracies? Can we or should we overcome the framework of methodological nationalism when we talk about the future of diverse democracies? Is the nation-state still the optimal scale for political action? How can diverse societies coexist with democratic institutions and governance structures on both the subnational and the supernational scales? How can the metaphor of the public park apply to diverse democracies of today?