It's just obsessed with itself - Montreal for instance seems a much stronger literary centre. Just think of all the major Canadian modernists who began there.
Printable View
I can quite easily understand why Edinburgh is on the list. Its a hub for the Arts. Edinburgh International Festival and the Fringe are two of the most popular in Europe.
Melbourne has a big literary festival and is big on promoting Sci Fi and Fantasy writing and writers.
You left Dickens (of all people!) off the list.
It's not only a matter of whether the writer was born there. Shakespeare wasn't born in London, but he spent all of his writing years there. Oscar Wilde spent his whole writing life in London as well and set most of his great works among the London upper classes. Several key works by Aldous Huxley and George Orwell are also set in London. Or think of Dr Johnson, Hazlitt etc. You can't remove Boswell and Johnson from London- it is a part of them. Just as it is a part of Pepys. In fact I should think pretty much every great writer and thinker from the British Isles has lived in and worked in and been influenced by London at some point.
If you judge it by cultural history, the only rivals to London are Paris and, maybe, New York, Florence (400 years ago), Rome and Athens (2500 years ago). Like New York and Paris, London is one of those places that draws in artists, writers and intellectuals from around the world-especially from the English speaking world. Think of the American writer T.S Eliot. His Waste Land is a London poem, full of references to places in London. Just as the English Auden sets one of his great poems in New York.
Paris, New York, London- those are the three great cities for me. So far as culture goes you'd have to put London and Paris ahead of New York simply for the cultural resonance that comes with 800 years of drawing in the best minds- of having works set in them and written in them.
My post was more just on the counting of authors like Williams. From all I can gather the only time he spent in Iowa was doing his undergraduate degree, or Cunningham who did his Master's there. That doesn't really make them writers people would associate significantly with Iowa City.
Seriously, 70,000 people live in Iowa city, it's the fifth largest city in the state.