When does American history begin and end?

American history has a history of 245 years as of 202 1.

The United States was founded on July 4th, 1776. George Washington served as commander-in-chief of the Continental Army, held the second continental congress in Philadelphia, and announced the formal establishment of the United States of America.

History of American development:

1 and1July 4, 776, the declaration of independence was issued, announcing the formal establishment of the United States of America and George Washington as the commander-in-chief of the continental army.

2. 1783 After the War of Independence ended, Britain recognized 13 colonial independence. 1787, the constitution of the United States was passed, and a federal state was established.

3. 186 1 to 1865, the American civil war broke out. Abraham lincoln led the free states in the north to defeat the slave states in the south. Since then, the United States has ended the "semi-slave and semi-free state" and started to implement free capitalism in an all-round way, and embarked on the road of rapid development.

1793, European powers jointly intervened in the French Revolution, and Washington adopted a neutral policy. The following year1October, 1 1, the federal government and Britain signed the Jay Treaty, which undermined the sovereignty of the United States. Pro-British and pro-French have become the dividing line between the federal party and democracy and the party in foreign policy. In internal affairs, the federal government formulated tariff regulations, established banks and stabilized the economy.

In 20021year, donald john trump was the president of the United States, and donald john trump was the 45th and 58th presidents of the United States (the term of office was 2017 65438+1October 20th ~ 2002165438+1October 20th). He is descended from German and Scottish immigrants who made peace. He was born in new york on June 1946. He is a real estate businessman. He went bankrupt six times and his credit was completely bankrupt.

Overview of the United States:

The United States is the fourth largest country in the world; The first Russia, the second Canada and the third China are about 9.629 million square kilometers, with a land area of 9.65438+0.5 million square kilometers and an inland water area of 200,000 square kilometers. The United States' sovereignty over the Great Lakes is about 6.5438+0.7 million square kilometers. The coastal waters such as estuaries, ports and inland seas cover an area of about 654.38 million square kilometers.

The population of America is about 3 1 10,000, ranking third in the world. The first is China, and the second is India, which is mainly white, but has a large immigrant population.

Major city

Washington: new york's functions are limited to the economic scope, while Washington, the capital of the United States, is a purely political center. Different from the function that Beijing, the capital of China, is a political, economic and cultural center, many cities in the United States have a single function. For example, Washington, the capital of the United States, is only the political center. In Washington, D.C., the most famous scenic spots are the Capitol, the White House and the Washington Monument directly opposite the White House.

New york is not only a financial center, but also a disaster center. His fame may become rich overnight because of the rebound of the stock market, or he may be ruined because of the collision of 9 1 1.

New york is a financial, cultural and artistic center.

New york is the largest and most populous city in the United States and one of the largest metropolitan areas in the world.

New york has a great influence on business and finance. There are five districts in this city: Manhattan, Queens, Brooklyn, Bronx and Staten Island.

New york is the largest port in the United States and the fourth largest metropolitan area in the world, next only to Tokyo, Seoul and Mexico City.

Historical events: September 200 1,1,9 1 1. Terrorists hijacked four planes, two of which crashed into two World Trade Centers and one crashed into the Pentagon, killing 3000 people. Los Angeles city

Los Angeles is the second largest city in the United States, second only to new york, and it is an international metropolis with great influence.

Los Angeles is the most populous city in California, with a population of over 4 million, second only to new york.

Universities have; California Institute of Technology, UCLA, USC, California State University in Los Angeles.

San Francisco San Francisco

Silicon Valley, the core of the world's high-paying science and technology industrial park, is located in San Francisco. Silicon Valley is an important electronic industry base in the United States and the most famous electronic industry gathering place in the world. With Cisco, Intel, Hewlett-Packard, Lucent, Apple and other big companies, integrating technology and production.

Chicago is located in the midwestern state of Illinois, with a population of over 9 million, second only to new york and Los Angeles.

Detroit Cadillac headquarters, the birthplace of Ford cars.

Seattle broadcasting aircraft manufacturer. The famous aviation city in Houston.

Time in the United States

The United States spans six time zones, Eastern Time, Central Time, Mountain Time, Pacific Time, Alaska Time and Hawaii Time. America is slower than Beijing 13- 18 hours.

The United States implements daylight saving time 10 from the second Sunday in March to the last Sunday in June every year. At that time, the time difference with Beijing was 12- 17 hours.

American climate

The United States borders the Atlantic Ocean and the Pacific Ocean to the east and west, the Gulf of Mexico to the south and Canada to the northeast. There are many rivers and diverse landforms in the United States, so the climate in different regions is different.

Topography and climate map of the United States The topography of the United States is mainly composed of a big river and two mountains. Mississippi River, Rocky Mountains, Appalachian Mountains.

1. As can be seen from this picture, the dark blue northeast coast and the Great Lakes region belong to "temperate continental humid climate". It is cold in winter, such as Syracuse University, which may not be suitable for students in the south. Summer is mild and rainy.

2. The green southeast and the Gulf Coast belong to a warm and humid "subtropical humid climate". For example, the climate in Florida is very hot.

3. Light blue central plain; Cold and warm air can be directly driven in, with hot summer and cold and snowy winter. Such as; Illinois. The inland plateau in the west of the brown zone; Winter is dry and cold, summer is dry and hot, and the annual rainfall is below 500 mm For example; Colorado

5. Western Pacific coast; The southern section belongs to "subtropical Mediterranean climate" and the northern section belongs to "temperate maritime climate". Such as; California

6. Temperate zone: the mainland is located in the northern temperate zone, Alaska is located in the northern cold zone, and Hawaii is located in the tropics.

American flag and national emblem

The American flag is a rectangular star-spangled banner with the theme of 13 red and white stripes, 7 red stripes and 6 white stripes. In the upper left corner of the flag is a long blue hairstyle, arranged horizontally in 9 rows.