Well, I think you have to take history classes again...
I get the impression that you think I doubt your claim that Norwegains are Vikings, I DON'T! Its true, they first came to America (well Canada anyway) and Iceland and Greenland too for that matter. I take that as a matter of fact that most people are or should be aware of this fact.
My point is that the Vikings were venturesome seafarers. From Denmark, Norway and Sweden they spread through Europe and the North Atlantic in the period of vigorous Scandinavian expansion (AD 800-1050) known as the Viking Age. Vikings were originally pagans and brought Christianity to Scandinavia.
Today is all three countries you can find actual Viking long boats in their respective museums, built in all three countries.
Map of Viking Scandinavia