BScN = Bachelor of Science in Nursing
I hear there's a few nurses that decide to move down to the U.S. Pay is a bit better, and some hospitals pay for airfare and accommodations for a certain period of time. As well, there may be incentives such as relocation money.
As far as I know, Canadian nurses must take the NCLEX. The only exception I've heard of is if you're working in Texas. The Canadian license is transferable to that state only.