Executive Summary: The current international order is based on the historical factors that unfolded in the past, one such major historical factor that shaped our current world is the shift of global power from the British Empire to the United States of America. The shift took place in the 20th century due to the unstable and ever-changing circumstances in the geopolitical realm. A host of different factors formed the rise of nationalism in Europe, anti-imperialist sentiments in colonies, and the First World War amongst others had a role to play in the unfolding of the event in question. The inter-war era i.e. the period of 1919-1945 which was the period of peace between the two World Wars could be said to be the most crucial period in this regard. The objective of this paper is to study the shift of political power from London to Washington in the inter-war period and to understand the effects of this seismic geopolitical change on the world at large. This paper will try to examine the shift by analyzing the economic, political, social, and geopolitical realities of the time. The various important events that occurred in the period like the Treaty of Versailles, humiliating conditions placed on Germany, formation of the League of Nations, etc. to understand their direct or indirect impact on the establishment of the United States of America as the global powerhouse that it today and how it first became a contender and them the victor of the cold war. The research uses several different research methods ranging from primary research, secondary sources, and comparative analysis of a few reliable sources that offer insight into the subject.