DESPITE THE EXTRAORDINARY decline in interstate wars over the past 70 years, many foreign-policy experts believe that the world is entering a new era in which they are becoming all too possible again. But there is a big difference between regional wars that might be triggered by the actions of a rogue state, such as North Korea or Iran, and those between great powers, which remain much less likely. Still, increased competition between America, Russia and China poses threats to the international order and does have a military dimension.
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