The US midwest includes states directly south of Ontario (e.g. Ohio). By that logic, Toronto could be call 'midwestern'. The Dakotas are referred to as the "upper Midwest".
At the end of the day, Canada doesn't use the term Midwest and despite the fact that the longitudinal centre of Canada is just a few miles east of Winnipeg, Ontarians will always say they are central Canada (not eastern Canada).
According to some folks, Nunavut is the centre of Canada
http://www.macleans.ca/news/canada/t...anadas-middle/