Institute Prof. Daron Acemoglu writes for Project Syndicate about why the U.S. and its allies never reconsidered a top-down state-building strategy in Afghanistan. “In viewing nation-building as a top-down, ‘state-first’ process, US policymakers were following a venerable tradition in political science,” writes Acemoglu. “The assumption is that if you can establish overwhelming military dominance over a territory and subdue all other sources of power, you can then impose your will. Yet in most places, this theory is only half right, at best; and in Afghanistan, it was dead wrong.”