Do you get endorsements on your licence in America?

Yes, although they're not called that; they're just points.

One thing I've noticed in posts you Brits have made about auto insurance is that you seem to understand it. In the US, it's all kind of a mystery. You just kind of have to try around and see what rates different companies will give you and then choose one and hope that their lack of physical presence is outweighed by the price or that their price is outweighed by the (vaguely) good service. And there doesn't seem to be any direct correlation between license points and rates. Or between anything and rates. I just got a new Volvo S60R to replace my 1987 BMW 325. For now, both cars are on my insurance. When I got the new car, my rates went down. I'm actually paying less by getting a new car. It makes no sense whatsoever.