South Dakota is closer to Canada than a lot of places are, but it doesn't border Canada. There are many US states that border Canada, so they are clearly closer to it than South Dakota, which doesn't. South Dakota is, however, closer to Canada than Florida is, for instance. South Dakota is also closer to Canada than it is to Mexico or England or South Africa. I'm not certain the intent of this question, but you might wish to clarify so that someone can answer more specifically what you need to know.
South Dakota is closer.
Canada is closer to South Dakota than Indiana.
South Dakota is closer to Canada. Whoever said the above is a retard. Idaho shares a border with canada. South Dakota shares a border with NORTH DAKOTA not canada.
Idaho shares a border with Canada. South Dakota does not.
Idaho
Only North Dakota shares a border with Canada.
Idaho is closer to Canada than South Dakota.
South Dakota to India is much farther than South Dakota to Canada.
South Dakota to Canada
South Dakota to Canada
South Dakota to Canada
The distance from South Dakota to Indiana is greater than the distance from South Dakota to Canada.