And, just in case other respondents to your proud message Canadien did not notice, the entire world, ESPECIALLY USA music buffs, **loved** 'Big Pink' and all the rest of the Band's releases!!!! Spirit-changing music - transformed our understanding of what R'n'R really was!!!
4 of the 5 members of the Band were indeed from Canada. Drummer Levon Helm is an Arkansas good ol' boy and has a southern drawl that would require a translator to be understood by any United States citizen living north of the Mason Dixon line. Levon talks the same way he sings on the song "Cripple Creek." The reason why the Band is so closely associated with Americana and American music in general, is because members relocated to upstate New York in the Sixties and most of their topical music is about rural life in the United States. "The Night They Drove Old Dixie Down", "Up on Cripple Creek", "Across the Great Divide", "Look Out Cleveland", King Harvest (Has Surely Come), Caledonia Mission, and Life Is A Carnival are songs specifically about the United States.
Even if they wrote songs exclusively about rural Canada, the Band would still be an Americana band because Canada is also part of North America. Any United States citizen who has traveled in Canada knows that once you travel outside of the eastern French speaking province of Quebec, it's hard to tell the difference between and citizen of Canada and a citizen of the United States. In the other 8 provinces of Canada, Canadian citizens walk, talk, dress and generally act like citizens of the USA. The only difference is they drink better brands of beer & have a much better health care plan than U.S. citizens.
The Band's "main songwriter," by whom I presume you mean Robbie Robertson, retains that appellation only with quotes around it. Although he managed to finagle the copyrights and hence enrich himself significantly, he was not the main songwriter of The Band, but merely one of them. The Band was in fact a highly collaborative effort.
Doesn't K.D. Lang deserve the Americana label for at least part of her catalog? Her first major solo recording was Shadowland, a collection of Country covers recorded in Nashville with the esteemed Country music producer Owen Bradley. Then there's Shania Twain, a queen of Country music, who hails from Windsor, Ontario...