How old is the history of America?

1July 4, 776 (American independence day). The Continental Congress formally adopted the Declaration of Independence in Philadelphia. After the war of independence,1September 3, 783, the United States and Britain signed the Treaty of Paris, and Britain recognized the independence of the United States. Immigrating to the United States is the largest immigrant country in the world, with more than 6,543,800 people immigrating to the United States every year. According to the data of the 2000 U.S. Census, at present, one in every 10 people in the United States was born abroad, with 28.4 million people, accounting for 1 1% of the U.S. population. In addition, 654.38+048 million people have parents born in foreign countries, and 654.38+027 million people have only one parent. According to the data of the US Census Bureau, in 2042, the proportion of whites in the US population will be less than half [2 1]. At present, these immigrants or their descendants mainly live in California, new york, Florida, Texas, New Jersey and Illinois, accounting for 70.4% of the total. Among them, 25.9% of California residents were born abroad, and new york 19.6%. In big cities, the foreign-born population in Los Angeles accounts for 29.6%, and that in new york is as high as 36.7%. In 2007, the racial composition of the United States was: white 80. 1%, Hispanic 15. 1%, African 12.8%, Asian 4.4%, Indian and Alaska Native 1.0%, Hawaiian Native and Pacific. Among them, the total population of African-Americans, Hispanics and Asians has reached1070,000. Native Americans are mostly Indians. Its ancestors crossed the Bering Strait from Asia to America about 40,000 years ago, or arrived through the frozen Strait Continental Bridge. They share some cultural features with their Asian contemporaries, such as using fire, training dogs and some special rituals and medical methods. Archaeology and anthropology believe that the ancestors of Indians had the same physique as China people, such as Gan, Argon, Iroquois, Sioux and Muskoch people in the United States. About 1 10,000 years ago, another group of Asians moved to the northern part of North America, that is, Eskimos. The first white people to come to America may be a group of adventurous fishermen, Vikings, who arrived on the east coast of North America a thousand years ago. In the next 150 years, many colonists came in and settled in the coastal areas, most of them came from Britain, and some came from France, Germany, the Netherlands, Ireland and other countries. Age In 2008, the average age of the American population was 36.7 years, including 35.4 years for males and 38. 1 year for females. The national average life expectancy is 78. 14 years, including 75.29 years for men and 8 1. 13 years for women. Surnames for a long time, the top ten most commonly used surnames in the United States are basically Anglo-Saxon surnames. According to the US Census Bureau, "Smith" is still the largest surname in the United States, with more than 2.3 million people using it. The second to tenth places are Johnson, Williams, Brown, Jones, Miller, Davis, Garcia, Rodriguez and Wilson. Among them, "Garcia" and "Rodriguez" two Latin American surnames entered the "Top Ten" for the first time. The change of the top ten surnames in the United States reflects the rapid increase of Latino population in the United States [22].