Big Apple
"The Big Apple" was popularized as a name for New York City by John J. Fitz Gerald in a number of horse-racing articles for the "New York Morning Telegraph" in the 1920s. The earliest of these was a casual reference on 3rd May, 1921:
American modernism
New York City is one of the most iconic cities in the United States and one of the major global cities of the world due to its important business, financial, trading and cultural organizations, such as Wall Street, United Nations, the Metropolitan Museum of Arts and Broadway theaters with their (in that time innovative) electric lighting. It is regarded as the birthplace of many American cultural movements, including the Harlem Renaissance in literature and abstract expressionism in visual art.