Huck begins and ends this novel by revealing his discomfort with being "sivilized". Why do you think he feels this way?What aspect of civilized society is twain criticizing?
In general, Huck dislikes being civilized because it forces him to be someone that he does not want to be. At the beginning of the story, his dislike is centered around fairly petty stuff -- what kind of clothes he wears, how much he uses tobacco, etc. By the end of the book, he is also unhappy with society's views on slavery in particular.
I think that Twain is really mostly criticizing civilization's emphasis on conformity. I do not think he is actually criticizing slavery so much since it is long dead at this point. So I think his target has to be the way that society tries to force people to be some certain way (and the people who blindly follow civilized rules).