The Twenty Years' Crisis: 1919–1939: An Introduction to the Study of International Relations is a book on international relations written by E. H. Carr.- The Twenty Years' Crisis
E. H. Carr The Twenty Years' Crisis (2001)  (New York: Perennial)- International relations
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Edward Hallett Carr (28 June 1892 – 3 November 1982) was a British historian, diplomat, journalist and international relations theorist, and an opponent of empiricism within historiography.
Carr was best known for A History of Soviet Russia, a 14-volume history of the Soviet Union from 1917 to 1929, for his writings on international relations, particularly The Twenty Years' Crisis, and for his book What Is History? in which he laid out historiographical principles rejecting traditional historical methods and practices.
John Joseph Mearsheimer (born December 14, 1947) is an American political scientist and international relations scholar, who belongs to the realist school of thought.
In a 2004 speech, Mearsheimer praised the British historian E. H. Carr for his 1939 book The Twenty Years' Crisis and argued that Carr was correct when he claimed that international relations were a struggle of all against all, with states always placing their own interests first.