How the changing world order may lead to a more volatile future

After a nearly 80-year period of stability shaped by the post-war world, the world order is shifting.

Here & Now's Scott Tong speaks with Margaret MacMillan, professor emeritus of international history at Oxford University and the author of the book "War: How Conflict Shaped Us," about how international norms and institutions are weakening, how spheres of influence and rivalry are developing, and what kind of new world order is emerging.