What are the motifs in The Bride Comes to Yellow Sky by Stephen Crane?

I think change is a motif that runs through the story. Firstly, there is the marriage of Jack Potter and the Bride. The Bride is of a lower class than Jack, and this is obvious to all they come across. Despite this, Jack, albeit worried about how they will be received, is happy to marry her and bring her back to his hometown. Secondly, the condescending attitude of the Negro waiters suggests a shift in the social hierarchy of the time. Finally, as Scratchy searches for an opponent, we see a change in accepted behavior.