Only five minutes and someone's right on the money! What I have so far is a bit of twist on the movie's ending (based on things mentioned in the book's ending); Project Mayhem is spread to nearly every major US city, and the detonation and demolition of every major banking companies' databases leads to economic turmoil. All debts are gone, all transactions erased, all credit vanished. Futhermore, in going more with the implications of the movie's ending, Jack/Joe/Narrator/Edward-Norton-in-that-one-movie embraces Tyler Durden's ideals and ideas in full.
The Durdenites spread further through the country into a real nation, the government of which is a near occult-level leader worshiping anti-consumerist fascist dictatorship that promotes the idea of utter hive-minded conformity that is only broken through extra-ordinary service to the state and people in sacrifice ("His name is Robert Paulson"), and whose economy is based up resource collection and redistribution (redistributed in 'bare minimum' fashion) and the surplus of which is sold by government run shops to citizens and foreigners alike if they can afford it with the salary tokens provided from government jobs. Asceticism is the status quo, and the idea is for everyone to be the same, but everyone being in a state of utter self-sufficiency. Fight Clubs, separate for males and females, become the societal brainwashing centers and loyalty proving grounds, as attendance once you reach the age of 18 is mandatory. Unsurprisingly, resistance to government authority is low once full initiation into a local Fight Club begins; dissidents are weeded out and told simply to leave or prove they have a better idea for how to do things. Considering only Tyler Durden and his hand picked successor Angelface are the ones with ambition and intiative, the system functions with shocking efficiency as corruption is punishable by death, and that means many critics are ignored as fools.
As for the Midwest, it's as you guessed! Anarcho-communists (with a hint of primitivism) seize the opportunity of the chaos to try and have their own revolution, not realizing the extent of the Durdenites' power. As both have anti-consumerism and conformity to 'Enlightened authority' as core idelas, they settled a peace between their groups early on. The Agrarian Republic of the Midwest organizes itself by gridding up everything, equally distributing it all, keeping the population strictly monitored to prevent a Malthusian scenario, and anything they can't make or grow is supplied from excess shops of the "Enlightened People's State of the Free".
And, of course, some neo-Confederates try their hand at rising up. Their rather hyper-capitalistic attitudes mean they did NOT get along with the Durdenites, and when said Durdenites became the EPSF, they just kept on fighting until a stalemate occurred.
