Final answer:
The destruction of a physical structure like the St. Louis Big Mound would not typically be caused by the nutritional state of a population; therefore, the option about starvation due to poor nutrition and food shortages is the least likely factor.
Step-by-step explanation:
The question asks which of the following factors did NOT contribute to the destruction of the St. Louis Big Mound. The options provided relate to various historical and environmental conditions that can affect populations and civilizations. Based on similar historical events, starvation due to poor nutrition and food shortages (d) would not be a contributing factor to the destruction of a mound, as mounds are physical structures usually destroyed by direct human action or environmental changes rather than the nutritional state of a population. In contrast, the other options could be aligned with the destruction or abandonment of a site due to the collapse of the societal system supporting it.