It creates the feeling of mystery. By drawing out or stretching the suspense for the reveal of true identity, the writer is able to tap into the imagination, curiosity and the feeling of the readers as they continue to formulate their own theories and hypothesis to satisfy their curiosity. An effective way in literature to keep readers invested.
Grand Canyon is the proper noun
I think you mean nullification. It was the idea that individual states could nullify federal laws if they felt like it.
My say would be yes. You should always stick up for yourself