Several of my teasers have harped on the theme of how to take a plot-essential situation and set it up so that the readers view it as a natural consequence of the setting. In one sense, it can be manipulative, but in another sense, as an author you have a vision of how things have always been. Your task is to communicate that vision in a way that feels effortless.
Setting up those expectations needn't be focused only on the immediate plot requirements. Because everything you write needs to be consistent in some way with the underlying truths of your fictional world as a whole.