
San Francisco Tour - What are Western Hemisphere Travel Initiative Passport and Visa Norms
As part of the Western Hemisphere Travel Initiative (WHTI), all travelers traveling between the United States and Canada, Mexico, Bermuda, and the Caribbean region are required to present a passport or other valid travel document to enter or re-enter the United States.
A new security regulation, in force from 2009, means that all visitors who do not need a visa under the US visa waiver programme will need to register online three days before travel. This will allow the US government to screen all visitors before travel. The new programme will be mandatory for all visa-free travel from 12 January 2009.
http://www.wordtravels.com/
http://www.worldtravelguide.net/country/292/passport_visa/North-America/United-States-of-America.html

