Assuming the absolute best intentions, it isn't a cohesive nation. Iraq was the same when I was there. Completely different people and politics, but they had no interest in being one people with a nation of their own. It was like pushing back the tide with a bucket. Fucking dumbYeah I'm reading a book on the Korean war. Dumbass American commanders basically sent South Korean peasants into battle with crack North Korean soldiers, many veterans of WW2 guerilla war against the Japanese and the Chinese Civil War against the nationalists. The ROK soldiers had little training, M1 Garands, no artillery or tank support. The North Koreans had Soviet machine guns, artillery and T-34 tanks.
The South Korean were diving under the tanks with grenades, prying the hatches upon try to shove grenades in, and made a fighting retreat all down the east coast of Korea protecting the US flank which kept the Pusan perimeter sustainable. Suffered something like 70,000 deaths in the first month of the war.
The Afghans have the latest in military hardware and training. The fact that they are breaking and running into Tajikistan or surrendering in mass tells you everything to know. That's not to say resistance won't stiffen near Kabul or that the other tribes that hate the Taliban won't keep fighting but there was never ever a chance if making a cohesive country out of the place even if that was the US aim which is extreme doubtful