IME, "British Literature" doesn't really exist as a discipline in Britain. That's way too broad. (Does "American Literature" exist in the US? Maybe, given that the literature of the US is so young.)
If you can say a bit more about what you're looking for and with what aims, I may be able to help.
That's a great point-- at the high school level, there are survey courses, though it is often broken out by genre or period.
"Early American Literature: Prose" for example, might include selections from authors through about 1820, and then additional coursework for poetry/dramatic works.
