NYC is a special case, because it’s at or near the center of the universe: the US financial hub, the center of theater, dominant in all entertainment media, the UN headquarters, the most important historical entry point for all immigrant groups, the most important city for book publishing, advertising, etc. It’s one of the five most important, powerful cities in the world. It has its own foreign policy and diplomatic relationships. Its mayors have frequently, and for many decades, been interviewed for their opinions on world affairs that would seem, at first glance, to have nothing to do with city government.