So my girlfriend doesn't have a passport, does this mean she will be unable to come? She has an ID and birth certificate. I don't think I could get a passport mailed to us in time unfortunately. Maybe there's some sort of temporary card that can be administered?

The topic subject speaks for itself but it's probably proper that I restate it in the message body: do Canadian citizens require a passport to enter the United States? I know at one point it wasn't necessary but I am not sure if the rules have changed. I believe it's OK for US citizens to enter Cana...