See GetYouHome.gov on the Western Hemisphere Initiative as to what's required to return.

The demand could accelerate with the second phase of the Western Hemisphere Travel Initiative.

The Western Hemisphere Travel Initiative was also implemented to prevent false documents.

It is accepted for travel by air, land and sea, per the Western Hemisphere Travel Initiative.

These documents are the result of the Western Hemisphere Travel Initiative.

It denotes both identity and citizenship, per the Western Hemisphere Travel Initiative.

The new passport requirement is part of the Western Hemisphere Travel Initiative, which was passed by Congress in 2004.

The second phase of the Western Hemisphere Travel Initiative took effect on June 1, 2009.

This requirement is known as the Western Hemisphere Travel Initiative, and was implemented in stages:

On Jan. 8, the first phase of the Western Hemisphere Travel Initiative will go into effect.