This narrative required that the land before European contact be imagined as essentially without significant human civilization.

Cahokia was direct evidence against this narrative.

A city of 10,000 to 20,000 people, planned, organized, and sustained for centuries, with trade networks spanning a continent and architectural achievements that remain impressive today — this was not the empty land the narrative required.

Acknowledging Cahokia meant acknowledging that the continent had been genuinely occupied, by genuinely sophisticated people, in ways that complicated the story of European settlement as civilization arriving in wilderness.

The specific choices that kept Cahokia out of the standard curriculum were made by textbook writers, curriculum designers, and educational administrators who were operating within the broader cultural framework that marginalized Native history generally.