What is the history of American development?

1. In the 196s and 197s, the relationship between 13 North American colonies and Britain became tense, which led to a series of armed conflicts in 1774 and 1775.

On July 4th, 1776, the representatives of 13 colonies attending the Second Continental Congress signed the Declaration of Independence of the United States, which turned the armed conflict into a war of independence. At the meeting, the representatives decided to create a continental army to fight against the British, led by George Washington.

In p>1781, the Confederacy Ordinance was approved by all 13 constituent states, and a permanent confederation was established.

2. Since the 19th century, "destiny is determined by nature" began to appear in the United States, and "manifest destiny" became the political slogan of the United States in the 19th century. One of the meanings was that Americans were "chosen by nature" and had to expand their territory and power. Under the leadership of American expansionism, the westward movement of the United States rose and began to expand to the west.

After * * * and the Party's abraham lincoln were elected president in 186, the conflict broke out completely, because Lincoln's * * and the Party opposed the expansion of slavery.

South Carolina became the first state to declare secession, and six southern states also seceded one after another. In 1861, the United States of America was established to oppose the federal government.

Shortly after Lincoln took office, the Civil War officially broke out. The American Civil War ended with the victory of the Union in 1865, and at the same time put an end to slavery and the dispute over whether the state had the right to secede from the Union. This civil war became a major watershed in American history. Since then, the power of the federal government has been greatly increased, and it has also established the position of * * * and the party in controlling American politics until 1933.

3. World War I broke out in 1914, and the United States initially remained neutral; The unrestricted submarine war launched by Germany sank an American ship (RMS Lusitania) sailing in the Atlantic Ocean, which caused many innocent casualties among American civilians and angered the American people. In the final stage of the war, the United States joined the Allies in 1917 to fight against the Allies.

after the Japanese attack on pearl harbor on December 7, 1941, the United States joined the anti-fascist alliance against the axis powers. The following battles became the most expensive war in American history. However, a large number of job opportunities created in the front and rear areas, as well as the production recovery driven by the military industry, made the American economy completely out of the haze of panic. As a result, American women have entered the workplace on a large scale.

After the victory of the war, the conflict between the United States and the Soviet Union gradually emerged. The United States represented a market economy model with capitalist policies in economy and a liberal democracy in politics, while the Soviet Union represented a planned economy model with socialist policies and a one-party dictatorship system. The rise of the Soviet Union and ideological conflicts caused the Cold War that began in the late 194s.

in the 199s, thanks to the digital revolution and a large number of job opportunities and technological changes made by the Internet, the American economy experienced unprecedented prosperity and growth, and the emerging Silicon Valley became the leading town of the world's information industry, and a large number of information industry companies such as Apple and Google were born.

4. Since the end of 28, the American economy has fallen into the subprime mortgage crisis, and the economy has been hit hard. Now it has entered a recovery period, and the unemployment rate has started to decline from the peak of 1%. However, the whole subprime mortgage crisis has not shaken the status of the United States as a world power.

On January 2th, 29, Barack Hussein Obama, the first African-American president in American history, was sworn in and left office in January 217.

On January 2th, 217, President Donald Trump was sworn in.

on January 2th, 221, Joe Biden, the oldest president in American history, was sworn in.

General situation of the United States

Located in central North America, the territory also includes Alaska in northwest North America and Hawaii Islands in the central Pacific Ocean. It borders Canada in the north, the Gulf of Mexico in the south, the Pacific Ocean in the west and the Atlantic Ocean in the east. Most areas have a continental climate, while the south has a subtropical climate. The temperature difference between the central and northern plains is very large. The average temperature in Chicago is-3℃ in January and 24℃ in July. The average temperature in the Gulf Coast is 11℃ in January and 28℃ in July.

It was originally an Indian settlement. At the end of 15th century, Spain, Holland, France and Britain began to immigrate to North America. By 1773, Britain had established 13 colonies. The War of Independence broke out in 1775. On July 4, 1776, the Declaration of Independence was adopted, and the United States of America was formally declared. The federal constitution was enacted in 1787, and Washington was inaugurated as the first president in 1789. In the 1 years after 1776, the territory of the United States expanded almost tenfold.

the above contents refer to the Ministry of foreign affairs-the United States.