The three major cities are New York, Los Angeles, and Chicago.

1. New York, located on the east coast of the United States, is the largest city in the United States. It is a global financial, cultural and commercial center with famous attractions such as the Statue of Liberty, Times Square and Central Park. Manhattan's Wall Street is the heart of global finance. New York is a multicultural melting pot that attracts people from all over the world, making it a vibrant and diverse city.

2. Los Angeles, located in southern California, is the second largest city in the United States. It is known around the world for the entertainment industry, especially film and television production, and is the home of Hollywood. In addition to media and entertainment, Los Angeles is home to beautiful beaches such as Santa Monica and Venice Beach, as well as diverse cultural and arts venues. The climate is warm and there is an abundance of outdoor activities and natural landscapes. The city is a multicultural fusion that attracts talents and tourists from all over the world.

3. Chicago, located in the Midwestern state of Illinois, is the third largest city in the United States. The city is known for its rich culture, architecture, and cuisine, especially its beloved Chicago-style pizza and hot dogs. It is an important commercial and financial center in the United States, home to the busy O'Hare International Airport and several cultural venues such as Mirny Park and the Art Institute of Chicago. Chicago is also an important birthplace of American blues and jazz, with a rich tradition of music and performing arts.