First Thank you all for your answers. I now feel that i was correct that only "First Nation" tribes can call themselves American.
My paternal Surname is a Scandinavian phrase for where my Ancestors Lived, and is very common in the North West of England, although I came from the South (or as we say "Saff"), if thats not a clue i do not know what is!!!.
I can see this will apply to Canada, Australia and New Zealand, I hope i am not causing any offence, its not meant to be.
My DNA make up is English, Scottish, Norwegain, Danish, German and a slight French.
I can trace back to Norway direct through my Paternal but so long ago that would be a small trace, however my French is Normandy, which is also a trace which probably comes from the Norman Conquest as they we originally Vikings, my Danish can be traced back to a Grandparent in 1200 along with the Norwegian, although it a bit further back.
My English trace is based on North West, Anglia, and South West, with small bits of Kent and London.
Some friends have been shocked to find they have a larger % of Scots and South West, when they believed it would be the Irish that would be the largest %.
I know DNA will vary within Siblings, sometimes but it is always a small variation, and that was what made me think about Colonial countries.
thank you for your answers and interest in the question