Part of the Problem

Kevin Drum printed a little map yesterday that sheds some light on the problem in Afghanistan.

From Wikipedia: "The Taliban (Pashto: طالبان ṭālibān, meaning 'students'), also Taleban, is a Sunni Islamist, predominantly Pashtun radical religious and political movement...." [My emphasis.]

Here's the map:


The border between Pakistan and Afghanistan is called the "Durand Line," and was established by the British in 1893. What were they thinking?