Notice how the register of the prose, with its figures and rates, evokes the rhetoric of nonfiction. The use of general, declarative sentences about Mexico, in particular, makes me think of what my journalism professors used to call the nut-graf—the paragraph in the article where the journalist briefly pauses her account of the news to establish, in the most efficient way possible, the context for the events on which she is reporting. The result is that Cummins’s book often slips into didacticism.