At the end of the Second World War, fewer than one in twenty-five people living in the UK were born abroad; now it is one in seven. The history of humankind is a story of us versus them, and the project of diverse democracies is a relatively new one - it is, in other words, a great experiment. How do identity groups with different ideologies and beliefs live together? Is it possible to embark on a democracy with shared values if our values are at odds? How to make diverse democracies work.