<<Isn't class consciousness a terrible curse?>>
Not at all, since the upper classes are very much aware of where their class interest lies and support only such candidates as will protect advance their class interests. AT the same time, when politicians arise who have working-class interests at heart, they are mercilessly attacked as waging class warfare.
Class consciousness is the very first step that the people can take in reclaiming majority control of your so-called "democracy."
<<Why should a citisen of the land thet claims to be "uninted " and brags "e pluribus unim" want to have class consciousness ?>>
"E pluribus unum" was not a slogan referring to unity of the classes but unity of states in a confederation. Similarly "United" in the context that you are using it refers to a union of states, not of classes.
<<Wouldn't haveing less class division be more desired?>>
Sure. Let the rich throw all their belongings into the common pot to share with all the rest of us. Then all will belong to one single class, which you seem to be claiming is the desired state.
The fact is, not only is the nation already divided into classes, but class war is and always has been underway. The problem is that while the rich recognize this very clearly and promote their own candidates very consistently, they have already won the class war on the propaganda front many times over, by promoting the view that "class war" and its promoters are very bad and divisive people. They have been so successful in fact that the working class is not even able to mount a counter-attack because they are conditioned to accept this negative view not only of class warfare (that it does not exist) but of class consciousness as well (that classes do not exist.) It is for this reason that class consciousness has to be seen as a necessary and as yet largely unrealized first step in the class war.