AIR TRAVEL

• All persons traveling by air outside of the United States are required to present a passport or      other valid travel document to enter or re-enter the United States.

LAND AND SEA TRAVEL

The following summarizes information available on the Department of Homeland Security’s website.

• CURRENTLY: 
  All U.S. citizens must show proof of identity and proof of U.S. citizenship when entering the United States from Canada, Mexico, Bermuda and the countries of the Caribbean by land or sea.Acceptable documents include: U.S. Passport Book, U.S. Passport Card, or other document approved by the Department of Homeland Security.U.S. citizens who do not have a single document verifying identity and citizenship must present both an identification and citizenship document; for example, a driver’s license and a copy of a birth certificate or naturalization certificate.
• LATER:
  On June 1, 2009, the U.S. government will implement the full requirements of the land and sea phase of WHTI. The proposed rules require most U.S. citizens entering the United States at sea or land ports of entry to have a passport, passport card, or other travel document approved by the Department of Homeland Security.

For more information please visit http://travel.state.gov/travel/cbpmc/cbpmc_2223.html