A walkout in the Texas legislature is just the most dramatic of broad efforts to restrict voting rights—in particular of minority voters. We examine the risks to America’s democracy. Changes in climate and populations are driving nomadic Nigerian herders into increasing conflict; how to preserve their way of life? And a new kind of space race aims for the silver screen. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer