This book is a collection of essays by leading scholars of the international history of the late nineteenth and early twentieth centuries that aims to explore the dynamics of the way in which diplomacy was conducted before, during and after the First World War. It is a history of the origins, nature and conduct of the so-called ‘new diplomacy,’ a phrase often used by historians of this period but not full understood. Other key themes include changes in the way war as a diplomatic tool was viewed in this period, primarily from the perspective of the British and American governments. This book also contributes to the growing literature on how the Paris Peace Conference and the peace treaties it produced were viewed from outside as well as inside Europe.