American troops in a heroin poppy field in Afghanistan Credit: The Guardian

After fighting the longest war in its history, the US stands at the brink of defeat in Afghanistan. How could this be possible? How could the world’s sole superpower have battled continuously for more than 16 years – deploying more than 100,000 troops at the conflict’s peak, sacrificing the lives of nearly 2,300 soldiers, spending more than $1tn (£740bn) on its military operations, lavishing a record $100bn more on “nation-building”, helping fund and train an army of 350,000 Afghan allies – and still not be able to pacify one of the world’s most impoverished nations? So dismal is the prospect of stability in Afghanistan that, in 2016, the Obama White House cancelled a planned withdrawal of its forces, ordering more than 8,000 troops to remain in the country indefinitely.

In the American failure lies a paradox: Washington’s massive military juggernaut has been stopped in its steel tracks by a small pink flower – the opium poppy. […]