Rural areas
Wringer washers remained good sellers in rural areas long after people in cities and suburbs had switched to automatics. In the Summer of '77 I worked in a store that was a Maytag dealer, and we delivered at least 3 ww's while I was there. That store always had at least one on display, and many times on nice days one would be rolled out onto the sidewalk, along with mowers, wheelbarrows, etc. The Speed Queen dealer a couple blocks away also had wringer models displayed.
In the part of Mississippi that my grandfather lived in, I remember seeing a LOT of wringer machines - his included. Some of them stayed on people's front porches. My Aunt Julie got a Kenmore automatic set when they moved into their house in '65, but used a wringer from when she and my uncle married in '61 till then. She was one of the first in that area to get an automatic! On the other hand, my Aunt Doris lived in the city, and got an automatic washer and dryer in the early 50's, but she was a working woman.
My opinion is that Canada has always had much more of a rural population, and if only rural areas in the US and Canada had been compared, the results would have been much closer.