谁能用英语介绍一下美国 50字左右 （急用）

The United States in the North Central and North America also includes the territory of Alaska and the Pacific northwest of the Hawaiian Islands in Central. North and the Canadian border, south through the Gulf of Mexico, west Pacific, East Bin Atlantic. Coastline of 22,680 kilometers. Most areas of continental climate, the southern subtropical climate. Big temperature difference between north-central plains, Chicago January average temperature -3 ℃, 7月24 ℃; Gulf Coast in January the average temperature of 11 ℃, 7月28 ℃.

Climate
The United States has almost all the world's climate types, in the main agricultural zone in rare severe drought, flooding is not uncommon, and a moderate while the temperature to adequate rainfall.

Climate impact on the United States is the main Arctic air, from the Pacific each year bring a large-scale low pressure, these low pressure through the Nevada mountains, the Rocky Mountains and the Cascade range, attach a great de