Try Orwell's "1984", Vladik. It is a bit like Britain's answer to Zamyatin's "Мы". CS Lewis is another favorite of basically everyone, though I'm ashamed to admit that I don't know him as well as I probably should (I've only read "Mere Christianity" as an adult, though I read "The Chronicles of Narnia" series as a child). On the other side of the pond, you can't get much more quintessentially American than Mark Twain. He and Kurt Vonnegut are probably my two favorites, though of course there are many runners' up. I read a lot of English-language authors in translation as a child, so I feel like I kind of missed out on some of what made Roald Dahl et. al. so special, but apparently those are good if you like fantasy stories. (Not fantasy like "sci-fi", but I figured i should throw in some kid stuff since someone else mentioned the one about the catepillar.)
Also, if we're allowed to include naturalized authors of foreign origins (which we must be, or else the excellent Joseph Conrad recommendation by Achronos must be out; he was a Pole who became a British citizen), then I must add Khalil Gibran (Lebanese American) to the list. "The Prophet" is his most famous work, but I have several others in addition to that and they are all incredibly beautiful works.