Barack Obama began his latest overseas trip on a mission to increase international cooperation, with a visit to Islam’s holiest land, Saudi Arabia, and its most dynamic intellectual hub, Cairo. He ended it four days later at a monument to what such common purpose can achieve. Sixty-five years ago today, 135,000 allied troops launched the largest seaborne invasion in history on the beaches of northern France, a move that would eventually decide the outcome of World War II.
