https://www.britannica.com/topic/20th-century-international-relations-2085155
Feb 28, 2022 · 20th-century international relations, history of the relations between states, especially the great powers, from approximately 1900 to 2000. The history of the 20th century was shaped by the changing relations of the world’s great powers. The first half of the century, the age of the World Wars and the start of the Cold War, was dominated by the rivalries of those …