Rana Dasgupta maps the decay of Britain and America, but his vision of what comes next is far less convincing than his diagnosis

It is apposite that ‘After Nations, The Making and Unmaking of a World Order’ – written by English novelist turned historian Rana Dasgupta – should be published as Donald Trump is desperately seeking to extract America from an ill-judged and calamitous war in Iran.

‘After Nations’ is an analysis of the rise and fall of the modern nation state – which Dasgupta sees as a uniquely powerful, secular political entity that first emerged in Western Europe some 300 years ago.…