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If the West has had any success in Afghanistan, it has been in encouraging India to make a massive investment there of economic aid, infrastructure projects and national prestige. New Delhi is the largest regional investor in the country, and ranks second among all donors. With the West’s looming defeat in Afghanistan, however, India’s success will prove Pyrrhic, and may well set the stage for another, perhaps nuclear, confrontation between Pakistan and India.

In their usual ahistorical manner, Washington and its NATO allies believed their 2001 occupation of the major Afghan cities signified not only the complete defeat of the Taliban and al-Qaeda, but also an erasure of two millennia of Afghan history and religion that afforded an opportunity to start the...