“The military takeover in Niger has upended years of Western counterterrorism efforts in West Africa and now poses wrenching new challenges for the Biden administration’s fight against Islamist militants on the continent. American-led efforts to degrade terrorist networks around the world have largely succeeded in longtime jihadist hot spots like Iraq, Syria, and Yemen. Not so in Africa, especially in the Sahel, the vast, semiarid region south of the Sahara where groups linked to Al Qaeda and the Islamic State are gaining ground at an alarming pace. Niger, an impoverished nation of 25 million people that is nearly twice the size of Texas, has recently been the exception to that trend.”