I cross the border a lot and can honestly say as a rule that getting in to the US is more of a hurdle than gettng in to Canada. Us customs is a lot more vigilant than the Canadian counterparts. You do not need a passport to enter Canada if your a US citizen. Going back the other way I can't comment as I AM CANADIAN! (my cannuck buddies will get the joke).
I travel with a passport anyway since it reduces hassles in both directions. Passports are tracking tools as well as identification and allow border security to trace your movement back and forth across the border with a couple of key strokes. That kind of traceability generally puts them at ease since they feel that you have less to hide if your using one.
I travel with a passport anyway since it reduces hassles in both directions. Passports are tracking tools as well as identification and allow border security to trace your movement back and forth across the border with a couple of key strokes. That kind of traceability generally puts them at ease since they feel that you have less to hide if your using one.