Britain - a country made up of an amalgamation of many different cultures - has over two thousand years of history. And that's just for the time we actually lived here.
In my experience, pre-GCSE (between ages 4 and 14/15) History is about Romans, Tudors, a little of World War 1 and a lot of World War 2. Schools can't get enough of that shit. Towards the end, there's also a lot of stuff about civil rights, particularly Martin Luther King Jr. I don't know about beyond mandatory History though, but my friends who did it said it was pretty much just about Germany between 1918 and 1939.
Nothing about the American Revolution, as far as I know.