Critically understood, to presuppose is to ask how we can make sense of something in terms of its development (history). As such, presupposing is a speculative "looking backwards" about what would have to be in order for us to understand what "is" (i.e. to call forth an antecedent or prior condition). This will often lead to multiple possibilities as to what gave rise to/produced (caused???) something...creating a web of causal factors to be evaluated.