A book by Stephen Tanner. Traces the various Empires and conquerers that have staked a claim on what is now Afghanistan.
From Alexander the Great right up to the United States. While the author seems pretty much pro US, he does admit that the US created a bin Laden type monster by arming and financially backing the mujahideen.
Sideline piece of interest. Page 304 tells of how Dick Morris, policy guru for Clinton, urged war on Iraq by using proxy troops, 'Shi'ites in the south and Kurds in the north' to topple Saddam, therebye avoiding US casualties.