Uh, yeah, right? Sure they don’t.
Then there is no reason to record my comings and goings at all if they aren’t keeping a record.
“Passport records do not include evidence of travel such as entrance/exit stamps, visas, residence permits, etc., since this information is entered into the passport book after it is issued.”
http://travel.state.gov/passport/npic/npic_872.html
Or perhaps you information on this question is more accurate than the actual State Department.
LOL
Well actually they do now because of the machine readable passports. When you go through immigration they swipe your passport. I travel between Europe and the US a few times a year. Also, even citizens in visa waiver countries have to pre-register before entering the US.