From the Twenties to the Seventies, New York achieved its ascendancy. While London struggled through blitz and austerity years that were both brutal and heroic, New York romped from the roaring Twenties to the Mad Men era. While 19th-century authors such as Henry James fled from boorish New York to urbane London, New York became a lodestar for émigré artists from Piet Mondrian to Salman Rushdie. The United Nations even gave New York the opportunity to claim global political importance, although cynical New Yorkers were never really too enthusiastic about that by-product of Woodrow Wilson’s idealism.