30: The end of history ends by Walter Russell Mead

The era in world history that began with the fall of the Soviet Union is drawing to its close. The post-Cold War Eurasian settlement that the United States and its allies imposed after 1990 has three big challengers - Russia, China and Iran. Read by Leighton Pugh.

Image: A symbol of American power, the National Capitol in Washington, DC. Credit: Christian Offenberg / Alamy Stock Photo.