On April 8, 1904, French Foreign Minister Théophile Declassé took a telephone call from Paul Cambon, his ambassador in London. “C’est signé!” Cambon roared into the phone—”It is signed!” The modern era’s most significant treaty, the Franco-British Entente Cordiale was signed. What had been one of the world’s most significant historical rivalries from shortly after the Norman Conquest in 1066 up to that April day in 1904, was over. France and England reached agreement on a host of issues, specified and sorted out in painstaking detail through three treaties signed at once. The world would never be the same.