Your passport is the definitive identification and while some people do cross the border at certain spots and do not have to show a passport, it will be
required at some border crossings and certainly at customs in the airport.
Not exact matches
It
requires a biometric entry and exit system to be built
at all
border crossings, but American and Canadian citizens would be exempted from those tests.
U.S. Customs will
require a faxed copy of the title
at least three days prior to
crossing the
border.
The basic restrictions on photography are (1) you can not trespass (you aren't), and (2) you can not take pictures of certain government operations (e.g. airport
border crossing — certain aspects of government prohibition may
require lawsuit to rein in government policy that is
at odds with the 1st Amendment; also secret military installations, for which there is specific law, 18 USC 795).