Responsible for powering the country and its economy, the U.S. energy grid has come under increasing strain due to climate change, and the threat of cyberattacks looms.  

In North Korea, all authority flows from Supreme Leader Kim Jong-un. He has reinstated the party as the central hub to consolidate his power and bring elites to heel.

Poland has maintained economic growth despite the global financial crisis and eurozone woes, while asserting itself as a leading advocate for greater European integration.