Afghanistan Graveyard of Empires

During the spring and summer of 2021, global news reports were filled with the impending US/NATO withdrawal from Afghanistan. At best, it would be viewed as a stalemate, with an orderly transition to a stable, US-backed Afghan government. At worse, it would be looked upon as two decades of futile war, ending with a shameful retreat that left the county at the mercy of a ruthless Taliban regime. What went wrong?
This close look at the history of foreign invasions of the country, from Alexander the Great to the US/NATO occupation, gives insight into the geographical and cultural reasons this land, in the valley of the Hindu Kush mountain range, has long earned the sobriquet: Graveyard of Empires.