In the northern part of the American continent, 500 years ago, this vast land was the home of Indians for generations. /kloc-in the 0/5th century, after Europeans discovered the new continent, immigrants from various European countries flocked and colonies appeared one after another. By the18th century, Britain had established 13 colonies on the Atlantic coast of North America. These 13 colonies defeated Britain in the War of Independence and declared their independence, becoming the United States of America, also known as "America". The emergence of this country is only 230 years, but it represents a rare miracle of the rise of a great power. On the basis of European civilization, it has embarked on an original development path. Based on major scientific and technological inventions, this newly industrialized country has occupied the position of the world's first economic power for more than a century. Become a veritable big country with 45 States and a population of more than 70 million.