The most obvious interpretation is that it was a defensive structure — a fortification designed to protect the city’s core from external attack.

If this interpretation is correct, it implies that Cahokia existed in a context of genuine military threat, that the city’s leaders felt it necessary to spend significant resources on defense, and that the political landscape of the upper Mississippi Valley at Cahokia’s height was competitive and potentially violent.

Some archaeologists have questioned whether defense was the primary function of the palisade, arguing that a wall that enclosed only the central precinct — leaving the vast majority of the population outside it — would have been an inefficient defense if the concern was protecting people from attack.

An alternative interpretation is that the palisade was primarily a boundary marker — a way of defining the sacred or restricted space of the central precinct and controlling access to it — rather than a military fortification.