Big Apple
"Big Apple" is a nickname for New York City. It was first popularized in the 1920s by John J. Fitz Gerald, a sports writer for the "New York Morning Telegraph". Its popularity since the 1970s is due in part to a promotional campaign by the New York tourist authorities.
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.