I drove a Corolla 2001 form the US today. All my years of driving, I have driven mostly cars from Europe. I complained to the car technicians that the stock driver side mirror had a narrow angle of view and that he should replace the mirror glass. He ended up buying a bigger size mirror glass and cutting it to size. However, it all looked the same to me- narrow angle of view with huge blind spot.
I was uncomfortable overtaking cars because I couldn't see over my left shoulder, in the region of the huge blind zone(not blind spot).

I then decided to scour the net for some information. Found out that the US requires unit magnification in the driver side mirror, same as Canada. This is achieved using a flat mirror which gives a narrow field of view. Regulations in most other countries permit planar, convex, or aspheric mirrors which improve the field of view while diminishing image size.
I now have to find a way to either cope with the flat mirror or order a planar, convex, or aspheric mirror. I think the rest of the world are thinking with their heads on. Don't know about the US National Highway Traffic Safety Administration.