Counties don't rule over other counties. Districts in each state are of similiar size (or at least are supposed to be) and they elect the legislature, not the counties.
Serving the interests of only their state leads to pork barrel spending. They are selected to represent their state at the federal level, not to get money thrown at their state.
And I suppose that every reason for creating something in the constitution is irrelevant now, since it is such an old document. No quartering troops? We don't need that one anymore. Someone hand me an eraser, I've got work to do!
