The world factbook

https://www.cia.gov/cia/publications/factbook/index.html

world facts and figures

http://www.worldfactsandfigures.com/gallery/

Countries of the world

http://www.theodora.com/wfb/abc_world_fact_book.html

Countries of the world

http://www.infoplease.com/countries.html

英语国家概况

http://www.for68.com/web/gjgk/

英美概况

http://www.chnpk.com/topicnews.aspx?tid=15

美国概况

http://www.cbwchina.com/global/america/

美国国家概况

http://www.jijiaoyuan.com/lx/page/guojia/uas/usa_gaikuang.htm

英语网址之家