Sanctions have become the go-to foreign policy tool for the United States. Coercive economic measures such as trade tariffs, financial penalties, and export controls affect large numbers of companies and states across the globe. Some of these penalties target nonstate actors, such as Colombian drug cartels and Islamist terror groups; others apply to entire countries, including North Korea, Iran, and Russia. U.S. policy makers see sanctions as a low-cost tactic, but in reality these measure...

Sanctions have become the go-to foreign policy tool for the United States. Coercive economic measures such as trade tariffs, financial penalties, and export controls affect large numbers of companies and states across the globe. Some of these penalties target nonstate actors, such as Colombian drug cartels and Islamist terror groups; others apply to entire countries, including North Korea, Iran, and Russia. U.S. policy makers see sanctions as a low-cost tactic, but in reality these measure...