I need to visit Canada in the process of completing my immigrant as PR. I wish to return USA after completing my immigration process. Currently I am on H1-B status and previously I was on F1 status. Since there is some time constrain I am not able to schedule any appointment in US consulate for my re-entry visa. I am wondering if one can enter USA from Canada with only H1-B document without visa? Help please, if any of you know anything about this.