Travel, Transportation, and Immigration

U.S. Passports and International Travel 
This site covers applying for a passport, a requirement for traveling out of the country. Other links include travel checklists and U.S.-issued travel alerts and warnings.

EPA and Dept. of Energy Fuel Economy

This website features updated fuel economy data for new and used passenger vehicles dating back to 1984, allows side-by-side comparisons, and offers fuel-saving tips.  There is also vehicle-specific air pollution emissions information, safety ratings, and links to car buying websites to help you make informed automotive purchase decisions.

U.S. Department of State Smart Traveler Enrollment Program (STEP) 
STEP is a free service for U.S. citizens to be registered with nearest U.S. Embassy or Consulate while traveling abroad. This allows the Embassy or Consulate to alert you about local safety issues while abroad and to facilitate communications in the case of an emergency.

Obtaining citizenship through naturalization 
This page covers how to become a U.S. citizen, including through military service or marriage.