If you're planning to fly to Mexico or Canada after Jan. 22, now would be a good time to submit passport applications to your local post office. On Jan. 23, new security requirements will mean Americans no longer will be able to re-enter the country with only a driver's license and birth certificate. The special relationship between the United States and its two North American neighbors is being phased out under the Intelligence Reform and Terrorism Prevention Act of 2004, first for U.S. citizens returning to their home country by air and then for all borders in a year or...