Who knows how America was formed? Can you help me?

Before Europeans came here, Indians and other North American aborigines lived in this vast land. According to legend, their ancestors crossed the Bering Strait and Siberia to North America about 10,000 years ago, and lived here. They don't have their own words, but they have rich oral literature. There are great differences in historical statistics about the aboriginal population. According to 1492 (Columbus first came to North America), the total number of North American Indians is about 8 million to10 million. With the deepening of European colonists, the health and territory of aborigines were seriously threatened. Due to various germs brought by Europeans, the indigenous population decreased by 90% in 150 years; Their village was destroyed, and the land originally used for animal husbandry or planting was also destroyed.

/kloc-At the beginning of the 7th century, Britain began to colonize North America. The first North American immigrants were mainly farmers who lost their land, hardworking workers and Puritans who were persecuted by religion. 1620, they took the Mayflower to North America and made the Mayflower Convention on board. On June165438+1October 2 1 day, the Puritans landed in Plymouth and signed the Mayflower Convention with 4 1 free adult men. The content is to organize citizen groups; Drafting laws and regulations, etc. Lay the foundation of autonomous government. In the18th century, the North American colonies gradually prospered and began to seek economic independence, reducing their dependence on Britain. However, this caused dissatisfaction in Britain, because Britain hoped to use the North American colonies as suppliers of cheap raw materials and dumping markets for goods. The British government took the lead in promulgating laws prohibiting colonial residents from exploring the west, forbidding them to issue their own banknotes, imposing heavy taxes on them and dissolving their parliament, which led to large-scale demonstrations by colonial residents. It was on March 5th, 1773 that the British authorities sent troops to shoot Boston residents who resisted Britain and created the "Boston Tea Incident".

1774, the British authorities promulgated five "intolerable bills", which intensified the contradictions between the two sides. 1774 On September 5th, except Georgia, 12 elected 56 representatives from the colonial congress, held the first continental congress in Philadelphia, adopted a declaration and established the continental association. People in New England organized militia, and adopted the Declaration of Independence on July 4th, 776, officially announcing the independence of 13 colony.

Under the leadership of George Washington, North American colonists won the American War of Independence against Britain and established the United States of America.

After more than 200 years of development, the territory of the United States has been expanding, and 37 States have joined the Federation. At present, there are 50 states, 1 federal special administrative region and some overseas territories. Its land area exceeds 9.62 million square kilometers, ranking third or fourth in the world (see the geographical part for territorial ranking disputes). With a population of about 300 million, the United States ranks third in the world, with diverse ethnic groups, mainly white people and a large immigrant population. The 50 white stars on the American flag represent 50 States; Every time a new state joins the Union, the American flag will add a star on the Independence Day (July 4th) of the following year. There are 7 red and 6 white stripes on the national flag, totaling 13, to commemorate the original independent 13 states.