New york, LA and new york are the largest cities and commercial ports in the United States. They are not only the financial centers in the United States, but also one of the financial centers in the world. New york is located at the mouth of the Hudson River in southeastern New York, bordering the Atlantic Ocean. It consists of five districts: Manhattan, Brooklyn, Bronx, Queens and Richmond, covering an area of 828.8 square kilometers, with an urban population of more than 7 million. Greater new york includes a suburban population of 6,543,800. New york is also the seat of the United Nations Headquarters, which is located on the east coast of Manhattan Island. Manhattan Island is the core of new york, with the smallest area among the five districts, only 57.9438+0 square kilometers, but it is the financial center of the United States. More than one-third of the 500 largest enterprises in the United States are headquartered here. Six of the seven major banks and the headquarters of major monopoly organizations have set up central strongholds here. It also concentrates the essence of the world's finance, securities, futures and insurance industries. Wall Street, located in the south of Manhattan Island, is the symbol of American wealth and economic strength, the base camp of American monopoly capital and the synonym of financial oligarchy. On both sides of this narrow street, which is only 540 meters long, there are more than 2900 financial and foreign trade institutions. The famous new york Stock Exchange and American Stock Exchange are located here. New york is the city with the most skyscrapers. Representative buildings include the Empire State Building, Chrysler Building, Rockefeller Center and later the World Trade Center (the World Trade Center collapsed due to terrorist attacks on September 1 2006). The Empire State Building and the World Trade Center Building have 100 floors, which are majestic and spectacular. Therefore, new york is called "a city that stands tall". New york is also the center of American culture, art, music and publishing, with numerous museums, galleries, libraries, scientific research institutions and art centers. The headquarters of the three major American radio and television networks and some influential newspapers and news agencies are located here. New york is also an important hub of railway transportation. The length of the subway in new york is over 1000 km, which is the longest and fastest subway transportation system in the world. There are three international airports in new york, among which the famous Kennedy International Airport undertakes 50% of the national air transport business of import and export goods and 35% of the international passenger transport business. New york is the region with the largest concentration of ethnic minorities in the United States. There are more than 6,543,800 blacks, mainly living in Harlem. The famous Chinatown has 1.5 million Chinese. There are also many Italians and Jews. City of angels is the second largest city in the United States after new york. Located in the south of California on the west coast of the United States, near the coasts of San Pedro Bay and Santa Monica Bay on the east side of the Pacific Ocean, and backed by San Gabriel Mountain, it covers an area of 1.200 square kilometers. The metropolitan area includes Los Angeles County, part of Orange County and Ventura County, and more than 80 towns such as Beverly Hills, Pasadena and Long Beach, with a total area of 65,438+00,567 square kilometers. The city is located in an open basin surrounded by mountains on three sides and facing the sea on one side. Except for some hills, the ground is flat, with an average elevation of 84 meters, and the highest point, Elsie Peak, is 1549 meters. The year is sunny, dry and rainy, and the climate is mild and pleasant, with an average temperature of about 12 degrees, 10/3.7 degrees in October and 23.4 degrees in July. The annual precipitation is only 357mm, mainly winter rain. 19 At the end of the 20th century, with the discovery of oil, Los Angeles began to rise and quickly developed into the largest city in the western United States. After World War II, with the rise of modern industry, the prosperity of commerce, finance and tourism, the surge of immigrants and the continuous expansion of urban areas, Los Angeles has become a megacity in the United States. Now Los Angeles has become the largest petrochemical, marine, aerospace and electronic industrial base in the United States. It is one of the major science and technology centers in the United States, with the largest number of scientists and engineers in the United States and the title of "City of Science and Technology", where the famous Silicon Valley is located. In recent years, the financial industry and commerce in Los Angeles have also developed rapidly. Hundreds of banks have set up offices in Los Angeles, including many famous international consortia, such as Lockheed, Northrop and Rockwell. Los Angeles has become a financial center after new york. Los Angeles is also the cultural and entertainment center of the United States. The famous "movie kingdom" Hollywood, charming Disneyland and beautiful Beverly Hills make Los Angeles a world-famous "movie city" and "tourist city". Freeways and city streets crisscross like cobwebs, extending in all directions. The road area of Los Angeles accounts for about 30% of the city's area. It is the most developed city in the United States and the city with the most cars in the United States. Los Angeles is also very developed in culture and education. There are world-famous California Institute of Technology, UCLA, University of Southern California, Huntington Library and Getty Museum. The Los Angeles Public Library has the third largest collection in the United States. Los Angeles is the largest industrial center in the western United States, and its manufacturing output accounts for about12 of California, ranking third in the country. Los Angeles is also a modern deep-water harbor. There is a famous thermos bottle project in Long Beach nearby, which is an artificial island for oil exploitation. There is a unique large inclined shaft on the island. A large number of immigrants have made Los Angeles a multi-ethnic and multi-cultural international city. Ethnic minorities account for about half of the city's population and there are many immigrant communities. Areas inhabited by various ethnic groups have formed their own "cities". Los Angeles is also one of the major gathering places for Chinese Americans, with about 400,000 Chinese. Chicago is the third largest city in the United States and the largest industrial center in the Great Lakes region. Located in the northeast of Illinois, at the southwest end of Lake Michigan. It covers an area of 590.5 square kilometers and has a population of 2.784 million (1990), of which blacks account for about 40%. The metropolitan area consists of six counties including Cook, including several neighboring cities in satellite towns and the northwest lakeside area in Indiana, with an area of 1206 1.6 square kilometers. Within 480 kilometers around Chicago, nearly 20% of the country's population is concentrated. The city extends to the west, north and south along the lakeside plain, with flat terrain. The climate is mild and humid. 65438+ 10, the monthly average temperature is -4.3℃, the July average temperature is 23.7℃, and the annual precipitation is 875 millimu. The northeast wind from Lake Michigan blows all the year round, and it is known as the "windy city". At the beginning of the 20th century, the Midwest was already the largest grain, meat and milk producing area in the United States. With the development of coal and iron resources in the Great Lakes region, Chicago has quickly become the largest city, transportation and industrial center in the central and western regions, and its commerce and financial industry have become increasingly prosperous. Chicago has a glorious history in the international workers' movement. It is the birthplace of International Labor Day (1886) and Women's Day (1909). Chicago has a complete industrial sector, with advantages in heavy industry and developed light industry. It is the largest steel and meat processing industrial base in China, and it is in a leading position in agricultural machinery, transportation machinery, chemistry, petrochemical industry, motors, aircraft engines and printing, as well as wood processing, paper making, electronics, textiles, clothing, flour and other industrial fields. Industries are mainly distributed in the north of Chicago and on both sides of the canal. Lupu Industrial Zone, which is close to the city center, has a high density of factories and is an important light industrial zone. There are many large-scale enterprises in Kaliumet Industrial Zone in the south of the city, which is a heavy chemical industrial zone dominated by steel, and there is the largest steel complex in the United States in the satellite city of Gary. Commerce and finance have flourished. There is a huge grain and livestock market in this city. There are more than a thousand trading companies, and the wholesale and retail are among the best in China. It is also a major mail order center in the world. Tourism is also very developed. Chicago is the largest railway hub in the United States, where more than 30 railway lines are assembled in the north-central United States. The total length of urban railway lines (65.438+0.24 million kilometers) and the annual freight volume (56.5438+0.2 billion tons) rank first among major cities in the world. Highway traffic is developed, and 12 highway trunk line passes through the territory, which is the center of the state highway system. In addition, it is also an important lake port in the Great Lakes region. Ships can go to sea through the Erie Canal-Hudson River or St. Lawrence River. There are three important airports in the city, among which O 'Hare International Airport, located in the northwest of the city, is the largest and busiest airport in the United States, with an annual passenger flow of 30-40 million. Lupu District, located at the mouth of the Chicago River, is the center of Chicago and the most prosperous business district. Its area only accounts for 1% of the city, but it concentrates about 1/6 employees in the city. The streets of Chicago are distributed in a grid, and modern high-rise buildings with different styles are dense. Sears Tower, with a height of 443 meters and a floor of 1 100, is the tallest building in the United States, followed by Standard Petroleum Building with a height of 346 meters and 80 floors, Hancock Center Building with a height of 343.5 meters and a floor of 100, Water Tower Plaza Building and First National Bank Building. At the western end of Lupu District, the Chicago River is divided into a south branch and a north branch. The north area between the North Branch and Lake Michigan has a beautiful environment and is a high-grade residential area with complete cultural and entertainment facilities. The southern district between the South Branch and Lake Michigan and the western district between the South Branch and the North Branch are mainly industrial areas, inhabited by blacks and many low-standard houses. There are many parks and green spaces in Chicago, covering an area of nearly 5,000 hectares. The lakeside "green belt" is the main leisure place for citizens, and there are also large forest reserves in the suburbs of Chicago. Chicago is one of the major cultural and educational centers in the United States. There are 95 colleges and universities in the capital circle. University of Chicago, founded in 189 1, enjoys an international reputation. Its Oriental College and Museum are famous for collecting oriental art treasures. There are also famous universities such as the University of Illinois, Illinois Institute of Technology and Northwestern University. Other important cultural facilities include the Art Institute, Art Museum, Science and Industry Museum, Shede Aquarium, Adler Planetarium, Historical Society, etc. The ancient water tower standing in the center of the city is a historical relic that survived the Chicago fire in 187 1.