安川驱动器刚性咋设置:用英文大概介绍一下美国

The United States belong to North America, mainly include three parts of mainland, Alaska and Hawaii, the area amounts to ten million meters of squares of 930 remainings, residing the fourth in the world, total population about 270,000,000, reside the 3 in the world, but the United States can be divided into 56 states again, among them woulding be Alaska biggestly.
The United States is the most economic flourishing one of the nation in the world, being the superpower of it still have the military real strenght of the male , but, this also come to a decision its hegemonism route, recent gulf war, Afghanistan war and Iraqi wars all have something to do with it. The American capital city is Washington, but the economic center is in New York, the main city contain New York, Los Angeles, Chicago,Houston , Washington, Seattle, Hawaii etc..