I do think that Canadians sound like Americans from the Western part of the United States except for a few words. I watch a lot of TV shows that are filmed in Canada especially Vancouver. Many of the actors and actresses are Canadians playing Americans. Most of the time they cover up the Canadian accent well. Every once in awhile, a word will sneak through. The giveaway words are "out", "about" and "organization". I find it amusing because it's not caught by the TV crews. The "eh" thing comes from a very old comedy TV show called Second City. I loved that show when I was a kid.