It was not necessary for anyone to explicitly decide that Cahokia would be suppressed.

It was sufficient that the people making decisions about what to include in American history curricula simply did not see Cahokia as part of the story they were telling, because the story they were telling had no room for it.

The correction of this absence is ongoing.

It is happening in academic archaeology, where the study of Cahokia has become increasingly sophisticated and increasingly prominent.

It is happening in some school curricula, where Native American history is receiving more thorough treatment than it did in earlier generations.