Afghanistan, the "Graveyard of Empires" for sure.
Disjointed population, very low literacy rate, no real govt., no roads or any real infrastructure.....has never really had a centralized power structure, clans/warlord/small town structure, this has been forever. 10 years of nation building isn't going to change that.
After ousting the Taliban, destroying the terror networks after 9/11 we should have left, that was the mission and it was accomplished. Instead we deploy NATO forces as well and occupy the country to do...uh, stuff and things.
Bad idea.