Trumpism doesn’t die with Trump – we need to wake up to the facts

It is fanciful to think that the unpredictable, aggressive and often self-sabotaging US will revert to its old ways once its current leader has gone. But, as Keir Giles explores in his new book, the fate of the globe depends upon us understanding that he doesn’t even need to cling to power to see the world continue to change in his image