Country Information
The land area of the USA is more than 3.7 million square miles (9.5 square kilometers). It is the fourth largest country in the world. Plus the territorial waters area, it is the third largest. The great economy, culture, science and military power of the USA leads to its significant role worldwide. No other country can exceed it. There is no official language in the US, but actually, English is the official language. Many immigrants or students from all over the world are attracted to settle or study in the US for its advanced technology and its free life style.

Population
By October 16th, 2006, the total population of the US reaches 300million, the third largest population after China and India. The increasing rate is 0.59%. According to the census survey of 2000, about 79% of the population lives in the urban. America is a multinational country with great differences between nations. More 31 nations in the country have a population of more than 1million people, even more nations with a population of less than 1million people. Most of the Americans (about 84% in 2004) are the descendants of European white people. Asian Americans are the third largest minority, about 3.7% in 2000. Most Asian Americans inhabit in the west coast and Hawaii. Most of the total population lives in the ten largest cities.

Climate
Due to a large territory and intensive geographical features, America has almost all types of climate of other places in the world. The comparatively ideal climates help to promote America to be the super power. There are seldom serious droughts or floods in the main cropland. The temperature is mild and rainfall is enough.

Temperature

城市
City 

温度
Temperature

一月January

二月February

三月March

四月April

五月
May

華盛頓Washington

 

1----8

-1---8

3--13

8--19

14--24

紐約New York

 

-3--5

-1--5

1--10

6--15

12--21

費城Philadelphia

 

-2--6

-2--6

2--11

7--17

13--23

波士頓Boston

average

1

2

7

9

15

芝加哥Chicago

 

-7--1.5

-7--1.5

2--11

2--11

13.5--23.5

三藩市
San Francisco

 

8--13

10--15

10-16

11-17

12-17

 

六月
June

七月
July

八月August

九月September

十月October

十一月November

十二月December

18--29

21--31

20--30

16--26

11--21

5--13

0—8

17--26

20--28

19--27

16--24

10--19

5--12

-2--6

18--27

21--30

20--29

16--25

10--20

5--13

-1--7

20

24

26

19

15

9

4

13.5—23.5

19.5—28.5

12--21

12--21

-2--6

-2--6

 

12-19

12-18

13-19

13-20

12-20

11-18

8-14

Time Difference

  Time Difference (to Hong Kong)
Summer 12 hours 
Winter 13 hours 

Transport
To link the vast territory together, America has constructed the very convenient super highway system. The national transport system mostly depends on those super highways. There are also transportation systems in big cities; the subway system in New York is the biggest one. But generally, the public transport in America is comparatively inferior to other developed countries. People usually travel in their own cars. Airline is the best way for long distance travel. 17 out of the world’s busiest airport are in the US.