It's quite well known in England, ilene. I remember reading it when I was about 11. However, I must confess that it didn't make me nearly so angry as the book I read straight afterwards- which was Anna Sewell's Black Beauty. Such are the workings of the eleven-year-old brain.
You might also like to know that I took "A" level History in my final years at an English High School, and that History course included a year-long specialism of American History from Independence to the Civil War, so I really had to deal with the slavery thing, and the Indian thing, and The Constitution along the way. As far as I know, Most American schools don't study British History at that kind of level, do they?