Who has a brief introduction to America?

The United States, whose full name is the United States of America and English name is the United States of America, is a presidential federation mainly located in North America. It consists of 50 states, one special zone, four overseas self-governing territories and some other territories. The United States covers an area of 9.63 million square kilometers and its capital is Washington, D.C.. Major cities include new york, Chicago, Los Angeles, Houston, Atlanta, San Diego, Boston, Seattle, San Francisco, Philadelphia and Denver. The United States, with a population of 330 million, is a typical immigrant country. Most of the population are descendants of immigrants from various countries, most of whom are descendants of Britain, Germany, Italy and Ireland, as well as native Indians. There is no official language in the United States, but English is the most common language. Other languages include Spanish, German, French, Italian and Chinese. Thirteen states in the eastern United States were originally British colonies and became independent from 1776, the year when the Declaration of Independence was issued. 1789 was officially founded, and the United States adopted the constitution. The midwestern states successively bought or annexed from France, Spain and Mexico. After World War II, the United States rose to become the largest country in the world, leading the world in politics, science and technology, economy, military affairs and culture. Wall Street in New York, USA is one of the financial centers in the world, and many famous banks and securities companies are headquartered here. Silicon Valley and Seattle are the centers of emerging high-tech industries, with the headquarters of internationally renowned companies such as Google. Houston and Tulsa are the oil capitals of the world, and many internationally renowned oil companies are located in these two places. Detroit is the automobile capital, and the headquarters of the three major automobile companies are located in this city. America is rich in tourism resources. There are many art galleries and museums in America. Las Vegas is one of the three largest gambling cities in the world and an internationally renowned luxury tourist city. The United States has a perfect national park system, including Yosemite, Yellowstone National Park, Grand Canyon, Great Smoky Mountain and other famous national parks. The United States has superior natural and geographical conditions, with a vast plain in the middle and the Mississippi River running through it from north to south, making it one of the largest planting areas in the world. With convenient shipping, the Great Lakes region is a base of chemical industry, manufacturing industry and heavy industry, as well as an important animal husbandry and cherry planting area. The south and California are sunny, and they are high-yield places for fruits and vegetables. The Appalachian Mountains in the east are rich in coal mines and natural gas. The Rocky Mountains and the Colorado Plateau in the west are rich in gold and copper deposits. American higher education also leads the world, with many internationally renowned universities such as Harvard University, Stanford University and Yale University. The American people love art, which is the birthplace of avant-garde art, and has also produced many music schools such as jazz, blues, hip-hop and country music. Broadway and Hollywood are the best drama and film centers in the world respectively. The United States is a space power, and its space agency, NASA, is the largest and most advanced space research organization in the world. The United States is also a big sports country, and people love sports, among which rugby, ice hockey, baseball and basketball are the most popular.