United States is the abbreviation of the United States of America. The United States is located in central North America, bordered by the Atlantic Ocean to the east, the Pacific Ocean to the west, Canada to the north, and the Gulf of Mexico to the south. The climate is diverse, most of which have a temperate continental climate and the south has a subtropical climate.

The United States has a land area of ​​96,229,091 million square kilometers (including a land area of ​​9,1589.6 million square kilometers), the mainland is 4,500 kilometers long from east to west, 2700 kilometers wide from north to south, and 22,680 kilometers long coastline. There are ten major regions: New England, Central, Mid-Atlantic, Southwest, Appalachian, Alpine, Southeast, Pacific Rim, Great Lakes, and Alaska and Hawaii. Divided into 50 states and Washington, DC, where the capital is located, there are a total of 3,042 counties. Alaska and Hawaii are located in the northeastern part of North America and the northern part of the Central Pacific, separated from the continental United States. In addition, the United States also has overseas territories such as islands, American Samoa, and the U.S. Virgin Islands; federal territories include Puerto Rico and Northern Mariana.

The 50 states in the United States are: Alabama (AL), Alaska (AK), Arizona (AZ), Arkansas (AR), California (CA), Colorado (CO), Connecticut (CT) , Delaware (DE), Florida (FL), Georgia (GA), Hawaii (HI), Idaho (ID), Illinois (IL), Indiana (IN), Iowa (IA), Kansas (KS ), Kentucky (KY), Louisiana (LA), Maine (ME), Maryland (MD), Massachusetts (MA), Michigan (MI), Minnesota (MN), Mississippi (MS), Missouri (MO), Montana (MT), Nebraska (NE), Nevada (NV), New Hampshire (NH), New Jersey (NJ), New Mexico (NM), New York (NY), North Carolina (NC), North Dakota ( ND), Ohio (OH), Oklahoma (OK), Oregon (OR), Pennsylvania (PA), Rhode Island (RI), South Carolina (SC), South Dakota (SD), Tennessee (TN), Texas (TX), Utah (UT), Vermont (VT), Virginia (VA), Washington (WA), West Virginia (WV), Wisconsin (WI), Wyoming (WY).

The land of the United States was originally an Indian settlement. At the end of the 15th century, Spain, the Netherlands, France, and Britain began to immigrate to North America. By 1773, Britain had established 13 colonies in North America. The American War of Independence broke out in 1775, and the "Declaration of Independence" was adopted on July 4, 1776, officially proclaiming the establishment of the United States of America. After the War of Independence ended in 1783, Britain recognized the independence of 13 colonies.

National flag: The American flag is the stars and stripes, which is a horizontal rectangle with a ratio of length to width of 19:10. The main body is composed of 13 red and white wide stripes, 7 red stripes and 6 white stripes; the upper left corner of the flag is a blue rectangle, of which 50 white five-pointed stars are arranged in 9 rows. Red symbolizes strength and courage, white represents purity and innocence, and blue symbolizes vigilance, perseverance and justice. The 13 broad bars represent the 13 states that first launched and won the War of Independence, and the 50 five-pointed stars represent the number of states in the United States of America. In 1818, the U.S. Congress passed a bill that fixed the red and white stripes on the flag to 13 and the number of five-pointed stars should be the same as the number of states in the United States. For each additional state, a star is added to the flag, which is generally implemented on July 4th of the second year after NSW joins. So far, the flag has increased to 50 stars, representing the 50 states of the United States.

The United States currently has a population of about 300 million, second only to China and India. The official language and common language of the United States are English, French, Spanish, etc. are used in some areas, and the residents mainly believe in Protestantism and Catholicism. Although the United States is a "young" country with a history of only more than 200 years, this does not prevent her from having many places of interest. The Statue of Liberty, the Golden Gate Bridge, the Grand Canyon of Colorado and other places are all world-famous.

The United States is the most developed country in the world today. Both its gross national product and foreign trade volume rank first in the world. In 2006, its gross national product reached US$13,321.685 billion, or US$43,995 per capita. The United States is rich in natural resources. Mineral reserves such as coal, oil, natural gas, iron ore, potash, phosphate, and sulfur are among the top in the world. Other minerals include aluminum, copper, lead, zinc, tungsten, molybdenum, uranium, bismuth, etc. . The total coal reserves are 3600 billion tons, the crude oil reserves are 27 billion barrels, and the natural gas reserves are 5.600 billion cubic meters. The industrial, agricultural and service industries in the United States are very developed, with a large number of scientific research institutions and researchers, and the technological level is absolutely leading in the world. There are many world-renowned cities in the United States. New York is the largest city in the United States and is known as the "Capital of the World"; Los Angeles is famous for its "Hollywood" located in the city; and Detroit is a well-known automobile production center.

An interesting fact-the origin of "Uncle Sam": The American nickname is "Uncle Sam". Legend has it that during the Anglo-American War in 1812, Sam Wilson, a businessman in Troy City, New York, wrote "u.s." on the barrels of beef supplied to the army, indicating that it was American property. This is exactly the same as the abbreviation (\"us\") of his nickname "Uncle Sam\" (\"Uncle Sam\"), so people joked that these materials marked with \"us\" are "Uncle Sam" of. Later, "Uncle Sam" gradually became the nickname of the United States. In the 1830s, American cartoonists again painted "Uncle Sam" as a tall, thin, white-haired old man with a star-striped top hat and a goatee. In 1961, the US Congress passed a resolution officially recognizing "Uncle Sam" as a symbol of the United States.

Washington: Washington is the capital of the United States, its full name is "Washington D.C." (Washington D.C.), named in memory of George Washington, the founding father of the United States, and Columbus, who discovered the American New World. Washington is administratively governed by the federal government and does not belong to any state.

Washington is located at the confluence of the Potomac and Anacastia Rivers between Maryland and Virginia. The urban area is 178 square kilometers, the total area of ​​the special zone is 6,094 square kilometers, and the population is about 550,000.

Washington is the political center of the United States. The White House, Congress, Supreme Court and most government agencies are located here. The Capitol was built on the highest point in the city called "Capitol Hill," and it is a symbol of Washington. The White House is a white marble circular building. It is the office and residence of successive American presidents after Washington. The oval-shaped office of the President of the United States is located in the West Wing of the White House, and outside the south window is the famous "Rose Garden." The South Lawn to the south of the White House's main building is the "Presidential Garden", where the President of the United States often holds ceremonies to welcome distinguished guests. The largest building in Washington by area is the Pentagon, where the US Department of Defense is located on the banks of the Potomac River.

There are many monuments in Washington. The Washington Monument, not far from the Capitol, is 169 meters high and made of white marble. Take the elevator to the top to get a panoramic view of the city. The Jefferson Memorial and Lincoln Memorial are also famous monuments in the United States. Washington is also one of the cultural centers of the United States. The Library of Congress, founded in 1800, is a world-renowned cultural facility.

New York: New York is the largest city in the United States and the largest commercial port. It is not only the financial center of the United States, but also one of the world's financial centers. New York is located at the mouth of the Hudson River in southeastern New York State, on the edge of the Atlantic Ocean. It consists of five districts: Manhattan, Brooklyn, Bronx, Queens, and Richmond. It covers an area of ​​828.8 square kilometers, and has an urban population of more than 7 million. The Greater New York City, including the suburbs, has a population of 18 million. New York is also home to the United Nations Headquarters, which is located on the East River of Manhattan Island.

Manhattan Island is the core of New York, with the smallest area of ​​the five districts, only 57.91 square kilometers. But this small island with narrow east and west and long north and south is the financial center of the United States. More than one-third of the 500 largest companies in the United States have their headquarters in Manhattan. Here also gathers the essence of the world's finance, securities, futures and insurance industries. Wall Street, located in the southern part of Manhattan Island, is a symbol of American wealth and economic strength. There are more than 2,900 financial and foreign trade institutions on both sides of this narrow street of only 540 meters. The famous New York Stock Exchange and American Stock Exchange are located here.

New York is also the city with the most skyscrapers. Representative buildings include the Empire State Building, Chrysler Building, Rockefeller Center and later the World Trade Center. Both the Empire State Building and the World Trade Center building have more than 100 floors. It stands tall and majestic. New York has therefore become known as the "Standing City". New York is also the center of American culture, art, music, and publishing. There are numerous museums, art galleries, libraries, scientific research institutions, and art centers. The three major US radio and television networks, as well as some influential newspapers and news agencies, are headquartered here. .

Los Angeles: Los Angeles (Los Angeles), located in southern California on the west coast of the United States, is the second largest city in the United States after New York. It is known for its rippling scenery, metropolis style, and prosperity. In one, it is a beautiful and dazzling coastal city on the west coast of the United States.

Los Angeles is the cultural and entertainment center of the United States. The endless beaches and bright sunshine, the famous "movie kingdom" Hollywood, the fascinating Disneyland, the beautiful Beverly Hills...make Los Angeles a world-famous "movie city" and "Tourism City". The cultural and educational undertakings in Los Angeles are also very developed. Here are the world-famous California Institute of Technology, University of California, Los Angeles, University of Southern California, Huntington Library, Getty Museum, etc. The Los Angeles Public Library has the third largest collection of books in the United States. Los Angeles is also one of the few cities in the world that has hosted two Summer Olympics.