I'm not sure what part of North Dakota you're in, but when I was stationed in Grand Forks there was only one school that I know of right outside the Air Force base that taught Kuk Sool Won and has since closed to my knowledge. I believe now there is a small ATA school and one other Tae Kwon Do (not sure if it's ITF or WTF) school there now.
As far as Wing Chun training, if you're near UND or the Air Force base you may want to check on the campus to see.