Write a short history of the discipline of International Relations in the 20th century.
The History of International relations began in the Peace of Westphalia in Europe around 1648. It was a stepping stone in modern state system’s development. Between 1500 and 1789, there was rise of sovereign and independent states as well as institutionalization of the military and diplomacy. 20th century saw a number of developments in terms of international relations, among other developments in the century include, the world wars, great depression and cold war later. All these contributed a great deal in shaping internal relations.