China's President Xi Jinping (R) shakes hands with US President Donald Trump before a bilateral meeting on the sidelines of the G20 Summit in Osaka. - From the Arab Spring to bloodletting in Syria, from Obama to Trump, from terror in the streets of Paris to Brexit, the 2010s began with hope for a more equitable world, and end with a slide towards nationalistic populism. (Photo by BRENDAN SMIALOWSKI/AFP via Getty Images)
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