Besides the two campaigns I once purposed, One where the city of Cahokia is the “main character” instead of a traditional hero and one about De Soto.
I also have a few ideas for Historical Battles.
Ani-kutani is a Cherokee story (they are part of the Iroquoian language group, they can be depicted as Iroquois/Haudenosaunee, but Mississippian will also work).
In this story the Cherokee tell how they rise up against the mound builders and there cruel priesthood, after their succes they promised each other they will have never have such hierarchical society.
I imagine it work out similar as the Age of Empires I Yamato campaign Coup where you need sent tribute every X minutes to your overlord in order to keep the peace until you are strong enough to defeat them.
The kingdom of Joara and explorer Juan Pardo, he build six forts (castles) in present day North Carolina. After he left all six forts are destroyed and burned down. On the largest fort they also build a mound. After that the Spanish never returned that far north.
(I think it would be good if a scenario only building a Wooden Fort would be added but function the same as a castle).
The Warrior Maiden could be an Iroquois/Haudenosaunee Historic Battle.
Etzanoa and the retreat of Juan de Oñate.
The story of Pahtahnkum could also be worked out as possible a Battle.
Crow Creek, my idea for the scenario need a bit of cultural background explanation that need to be told in the opening narration.
In a lot of North American cultures you can be adopted in to their society if you are needed/worthy, the narrator is adopted in the Crow Creek settlement, but when he was out hunting and standing on top of a cliff, he see a big war party approaching under the cliff. He recognise that the war party is part of his old society.
In game you control a Mississippian scout unit and need to deicide to run back to Crow Creek settlement and help to defend it, or run to the war party camp and join up your old group and attack Crow Creek.
And lastly, of course it would be cool to see the Viking encounter from the Native perspective, (but of course the Mississippians were not even close to that).
I also leave this here, this an archaeological rendition of Etowah. A city that thrived between 1000-1550 in the state of Georgia. I love the moat they digged around it.
For more information about defence work and Mississippian warfare.
The more I learn about the Mississippians the more I think they can have a spot in Age of Empires, still they are not my first choice for the Americas. But after a Mesoamerica en South America DLC I see it definitely as a strong option.
The hard part is ignorance, it goes to against most stereotypes that people have about Native Americas and Age of Empires is often mostly based on pop history.