Listed below are major U.S. Government Departments web sites:

Department of Agriculture

http://www.usda.gov

Animal and Plant Health Inspection Service
http://www.aphis.usda.gov

Food Safety and Inspection Service
http://www.usda.gov/fsis

Foreign Agriculture Service
http://www.fas.usda.gov

Department of Commerce

http://www.doc.gov

Bureau of the Census
http://www.census.gov

Bureau of Economic Analysis
http://www.bea.gov

Bureau of Industry & Security (formerly the Bureau of Export Administration)
http://www.bis.doc.gov

International Trade Administration
http://www.ita.doc.gov

US Patent and Trademark Office
http://www.uspto.gov

Department of Health and Human Services

http://www.dhhs.gov

Food and Drug Administration (FDA)
www.fda.org

Department of State

http://www.state.gov

Visa Services
http://www.travel.state.gov/visa/visa_1750.html

Department of the Treasury

http://www.ustreas.gov

Department of Homeland Security

http://www.dhs.gov

US Federal Regional Offices

Bureau of Labor Statistics
http://www.bls.gov

Drug Enforcement Administration (DEA)
http://www.usdoj.gov/dea

Others

留学USA
http://www.liuxueusa.cn

Education USA
http://www.educationusa.state.gov