Discover why New York City is the most populous U.S. city, boasting over 8.3 million residents across its five boroughs.

World leaders arrive for U.N. General Assembly 01:37. NEW YORK -- World leaders are set to arrive in New York City for the 78th session of the United Nations General Assembly. This year will be ...

There have been many memorable moments in the 80-year history of the United Nations, both at its headquarters in New York and at its far-flung global operations. Here are photos of some of the U.N.'s ...

By the end of this century, the United Nations projects that the world’s population will stabilize at around 10.4 billion, nearly 4 billion of whom will be living in Africa (38 per cent), up ...