Sharing Knife location

In the first book of Lois McMaster Bujold's SHARING KNIFE series I
thought the world Bujold created was wholly a secondary world. But in
the second volume there are some clues, both geographical and
zoological, that suggested to me that the story might actually be set
in North America. Perhaps, even, a far future North America, isolated
from the other continents (perhaps because of the menace of the
bogles). I may be way off base about this, but that's a notion I had
while reading the book.

Anybody get the same notion?