The United Nations’ top leadership position has broad authority to steer the organization’s agenda, but its impact has varied widely since 1946.

Comprehensive immigration reform has eluded Congress for decades. Presidents have increasingly turned to executive action to reshape asylum and border policy.

Al-Shabaab remains capable of carrying out massive attacks in Somalia and nearby countries despite a long-running African Union offensive against the Islamist terrorist group.

President Trump’s decision to levy tariffs on China highlights concern about the ongoing role of the WTO and the future of global trade rules.