It depends upon the exam board. Some will have the American Revolution (most do). It is then further the choice of students (and teachers) if they wish to study it. I personally chose to study Hitler's rise to power and post-war Germany.
EDIT : Huh, I just checked most of the exam boards and I couldn't find the American Revolution in any curriculum.
English
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Where the hell do you live?
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WM. Why? This is the case.