Prehaps a bush variety of oak with non-bitter acorns. Still have the domesticated animal problem though.
If the Mississippians could have gained access to the better strains of Mesoamerican maize they would have been able to avoid collapse, and grow further. Considering the Maya were known to trade with the Taino in the Caribbean, it's not that much of a stretch to get a PoD to create stable contact between both of these cultural spheres.
I remember an Irish-wank TL on the old frontpage of this site which did something with the Mississippian civilisation, but I think it just turned them into a cartoonishly evil baddie for the Irish superpower. (Yeah...)
Living in California myself, if faster growing varieties of oaks could be domesticated, a Californian civilization based around the Sacramento-San Joaquin River Valley seems completely plausible. If you want to write a TL on the subject, I have a good amount of knowledge on the subject of Precolumbian California.
Bitterness of oak acorns is not the problem IMO actually: After all, they were a staple throughout the Californian Cultural Area.Prehaps a bush variety of oak with non-bitter acorns. Still have the domesticated animal problem though.
If the Mississippians could have gained access to the better strains of Mesoamerican maize they would have been able to avoid collapse, and grow further.
1) maize is deficient in a vital amino acid, lysine iirc. The MesoAmerica varieties were just as deficient as the varieties that moved north.
2) even if they had beans, which Im not sure of, that doesnt replenish the soil fast enough. Iroquoian towns had to move to virgin soil every 20 years or so, as the soil nutrients got depleted, for example.
3) the Mississippian cultures with cities and massive ceremonial complexes couldnt be moved, so the soil got poorer and poorer. Skeletons from later years show significant malnutrition.
What they really need is domestic animal, preferably draft animals, to manure tne fields and restore fertility.
that's true... people tend to forget about the use of manure for keeping fields fertile. And one more reason why the Fertile Crescent was such a bonanza, having easy to domesticate plants and big animals both, all handy in one spot. Thus, a 'river valley civilization' that has only domestic plants may not do so well...
Can the use of the guano of the turkeys and the excrement of the llamas be used to fertilize fields?
1) maize is deficient in a vital amino acid, lysine iirc. The MesoAmerica varieties were just as deficient as the varieties that moved north.
2) even if they had beans, which Im not sure of, that doesnt replenish the soil fast enough. Iroquoian towns had to move to virgin soil every 20 years or so, as the soil nutrients got depleted, for example.
3) the Mississippian cultures with cities and massive ceremonial complexes couldnt be moved, so the soil got poorer and poorer. Skeletons from later years show significant malnutrition.
What they really need is domestic animal, preferably draft animals, to manure tne fields and restore fertility.
But the societies of Mesoamerica DID have draft animals to provide manure.I'm not calling this bullshit by any means, so don't take this that way, but I need to see more evidence. Domestic animals of course would be a major boon in stabilizing and enhancing agriculture, it goes without saying, but by this logic this would mean that the urban societies of Mesoamerica couldn't exist either. So I'm doing research on this myself, and any sources you could provide would be helpful.
The museum is very informative about what we know about the Mississippian culture, it treats the subject respectfully, and the guides couldn't be any friendlier or more knowledgeable. When our tour guide on Monk's Mound (was it Rebecca?) said it is clear they grew corn here but not beans, it piqued my interest, since that would lead to malnutrition, not getting enough essential amino acids without the vegetable protein. She was right on top of it and said that may have been one of the reasons the culture eventually left the area. It's clear to me that she had studied her subject extensively. (Most American Indian cultures I have learned about grew the Three Sisters--corn, beans, and squash. Corn stalks supported the beans as a trellis, and the beans are nitrogen-fixers that fertilize the soil for the nitrogen-hungry corn, and the squash are just good winter keepers and nutritious.)
Cahokia reached its peak size around 1250 AD and then began to decline to the point that by about 1400 AD it was completely abandoned. An interesting phenomenon also occurred in the region. Virtually, all the towns in the Middle Mississippi basin were abandoned concurrently. Most were never reoccupied. The Middle Mississippi River Basin had very few occupants between 1400 AD and 1600 AD. Where did the people go? No one has yet to come up any hard evidence of their new homeland.
Anthropologists and forensic biologists are not in full agreement as to the cause of Cahokia’s abandonment. It is known that after 1000 AD the skeletons of commoners show increasing signs of malnutrition and disease. The commoner’s diets were deficient in protein and iron. Apparently, the people of Cahokia did not have many domesticated animals and therefore, remained dependent on hunting and fishing for most or all of their animal proteins. Generations of dense population in the region would have eventually exterminated the wild animal population. To obtain animal protein, it would have been necessary for Cahokia to constantly send out large hunting parties, which undoubtedly intruded on the territories of other ethnic groups.
Toward the end of Cahokia’s life span, even the skeletons of the elite show signs of inadequate protein, calcium and iron. Chronic malnutrition would have made the population more vulnerable to plagues.
'crop package' is the key thing here. If you want a river valley civilization, you have to have a reliable food source, something beyond 'hunter/gathering'. A lot of the places mentioned on this topic seem to have had river valley civilizations, but only after crop packages/domesticated animals got there from somewhere else. If the POD here is to kickstart them earlier... gotta get them something to farm. Not sure of just what the OP is looking for here... are we looking for other absolutely first 'cradles of civilization' comparable in time and scale to Mesopotamia and Egypt, or just other river valley civilizations regardless of the time they start? The first is difficult, the second not so much...
There's also the wild rice horticulture of the Great Lakes region, but it has an inherently limited range.