This document lists and provides brief descriptions of important cities in the USA, including New York, Los Angeles, Washington D.C., Chicago, San Francisco, Las Vegas, Miami, Hawaii, and Orlando. It notes that New York is the most populous city, Los Angeles is located in California, Washington D.C. is the capital, Chicago has the third largest metropolitan population, and cities like San Francisco, Las Vegas, Miami, and Orlando are also economically and culturally significant urban areas within the United States.