From a hardscrabble childhood in the Great Depression on the dusty plains of rural Nebraska, Clayton Yeutter (1930-2017) rose to work for four U.S. presidents, serving in the cabinets of two of them. His challenge, posed by one of President Ronald Reagan's aides, was this: go and change the world. As U.S. trade representative he did just that, opening the global trading arena with bold efforts that led to NAFTA, the creation of the World Trade Organization,...