Lieutenant General Frank Kearney (Ret.) and Ari Tabatabai reflect on how the post-9/11 era transformed American warfare and continues to shape US national security 25 years later.

Thant Myint-U and Leslie Vinjamuri discuss why the international system is struggling to prevent and resolve conflict, and what it will take to build a more peaceful future.

Rana Foroohar and Leslie Vinjamuri discuss how a rapidly changing Arctic is creating a new frontier for global competition and American power.