So, assuming 1946 game start, Afghanistan is a monarchy (hereditary permanent head of state) with an appointed Prime Minister (arbitrary length). Halfway through the first year in the game (effectively a first-day before-unpause player move), the King appoints a Conservative ideology Prime Minister. They do several political reforms, but end up withdrawing reforms because they risk electing Liberals to power. If they ended up holding elections, the Liberals could win, and their supporters would want to side-line the King, and have at best a full constitutional monarchy, at worst, a republic. The player is playing in the Kings interests mostly, sooooo, out goes the Conservative, in comes the Autocrat ideology.
The date is now 1953, and we've seen Afghanistan go from Autocrat to Conservative, threaten to go Liberal, and return to Autocrat. Under the Autocrats, we see a decade of leaning towards the Soviets and away from Pakistan. Trade with Pakistan is high, so the loss of relations hurts the economy, raising unrest. To try and deal with this, the player decides to try some democratic reforms again. Switching ideology again back to Conservative, they start allowing other parties to organize. Oooops, he's seeing a huge rise in extremist parties, Fundamentalists, Neo-Fascists, and various Communist parties. Two of those are the Stalinist Khalq or Masses faction, and the Leninist Parcham or Banner faction. They're treated as two different "parties" in game, despite both officially being parts of the People's Democratic Party. Additionally, the powerful Authoritarian ideology gains unrest and organization, and, through events, changes the policies they support; they no longer support the monarchy.
The date is now 1973, and we've seen Afghanistan go Autocrat to Conservative to Autocrat to Conservative. 1973 sees a peaceful coup. The Autocrats declare a Republic, in-game a Dictatorship. Thus far, we've peacefully switched Prime Ministers 4 times, and once had a peaceful coup regime change. This is our first crisis point; this is a full regime change, yet there was no bloodshed, no opportunity to fight against it. Autocratic unrest and organization got high enough that they were able to win enough of the military that no resistance was possible. The only way to fight this would be to prevent their unrest and organization from rising. The player shrugs their shoulders, and begins solidifying Autocratic rule. When playing as the Monarchy, they were alternating giving and repealing rights to deal with dissent, and now they decide to try something else, a brutal crackdown, outlawing all other parties. The other parties have already raised their Organization enough that the outlawing doesn't affect them much, and just raises Unrest through the roof.
1978, the Khalqis lead their own coup, this one bloody. Still, it only takes a single day. Again, there wasn't a civil war, no movement of soldiers, no frontlines. You COULD I guess have a single-day battle in which the Khalqi-aligned tank battalion stationed on the outskirts of Kabul attacked a garrison unit in the city itself, with support from an air battalion, and won in a single day, but also, effectively, no way to fight against the coup once its launched, at least from the perspective of a player.
Now, by default, when a Communist wins, only the three Communist ideology parties are legalized. The Player decides to play as a caricature of a Communist dictatorship, and decides that only the Khalqis should have power, outlawing the other parties. He enacts Secularism policies, which pisses of the Fundamentalists. Unrest is rising to ridiculously high levels nationwide.
The Soviets invade in '79, and oust the Khalqis in favour of the Parchams. So we've had a peaceful coup, a bloody coup, and a foreign invasion to change government. Now, while the Parchams may be less extreme than the Khalqis, the very act of a coup raises unrest among all who do not share the ideologies of the coup. This finally triggers the long-awaited Fundamentalist revolt. Lacking support amongst the military, instead they spawn Irregulars/Insurgents, who control the highlands. This is our second real crisis, how to model this new civil war. I think that the Player should be given the option to tag switch to the Insurgents. Pakistan gives aid to the the Fundamentalists, both monetary and equipment. The USSR gives aid to the Autocrats mostly. I know, historically they were also fundamentalist, but for game-play purposes, there needs to be a difference between the Taliban and the anti-Communist rebels. So, we effectively have a three-tag civil war, with two of the rebel tags at peace with each other. The USSR unrest rises due to war exhaustion, so they withdraw after 10 years, leaving the Parchams to fight the revolt on their own. He survives three years. I believe the player tag-switched to the Autocrats when their revolt started, figuring perhaps an Afghanistan backed by the US could have some weight in the region.
The Autocrats are the initial winners, backed by the US. They become the new Afghanistan, but the Fundamentalists don't end their civil war. The player is still holding on to hope, and continues to fight against the Fundamentalists. The Fundamentalists manage to capture the Afghanistan tag, but the player decides that he can still maintain control, deciding to hold on to the new Authoritarian United Front dynamic tag til death. He manages to hold on until renewed US aid and intervention hands him the Afghanistan tag again, after 9/11. The Fundamentalists keep a rebel Dynamic tag, holding on to at least one province up to the modern day, rising and falling.