A year ago Donald Trump produced the biggest political upset in modern day USA, but were there historical clues that pointed to his unexpected victory?

Flying into Los Angeles, a descent that takes you from the desert, over the mountains, to the outer suburbs dotted with swimming pools shaped like kidneys, always brings on a near narcotic surge of nostalgia.

This was the flight path I followed more than 30 years ago, as I fulfilled a boyhood dream to make my first trip to the United States. America had always fired my imagination, both as a place and as an idea. So as I entered the immigration hall, under the winsome smile of America's movie star president, it was hardly a case of love at first sight.