Hi....I would like to know if i can use the visa stamp on my passport to travel back and forth to Canada? I came in to the States on the 13th of June and have not received any welcome letter or the actual green card. I already got my social security card. I got my immigrant visa issued on the 6th of january so i came to the states a few weeks before the expired date 6th of july. Please can anyone help i need to go back to Canada asap.