By Nicole Gaouette
The crises that dominate today’s news — Ukraine, Islamic State, Libya, Ebola, Gaza, cyber-attacks — are symptoms of the most profound revolution in world affairs in almost four centuries.
A toxic stew of new technologies, old hatreds, eroding boundaries, tattered alliances, environmental dangers and independent groups are making the world more interconnected and less stable at an accelerating rate, forcing the U.S. and other nations to re-invent their approaches to defending their borders, populations and economies.