History

Hatano Sumio

Japan's Postwar Historical Perception

Professor Emeritus of Political and Diplomatic History at the University of Tsukuba, and a leading expert on postwar Japanese politics.

How does Japan perceive its postwar history?

 Japan continues to face tensions with its neighboring countries over historical issues. In particular, relations between Japan and South Korea, as well as Japan and China, have long been strained over matters such as colonial rule, the Second Sino-Japanese War, the issue of "comfort women" used by the Japanese military, and controversies surrounding history textbooks. Many people wonder: Why has Japan failed to come to terms with its past? Why does it deny or distort historical truths rather than addressing them honestly?


 Professor Sumio Hatano, Professor Emeritus of Japanese Political and Diplomatic History at the University of Tsukuba, identifies the root cause of these historical issues in the San Francisco Peace Treaty signed in 1951. This treaty, which marked the postwar settlement following Japan’s defeat in the Pacific War, was primarily shaped by the United States. The original U.S. draft included strict terms addressing Japan’s war responsibility, the prosecution of war criminals, and significant reparations.


 However, Professor Hatano explains the historical and political context that led to a very different final version of the treaty—one that significantly softened these provisions. He emphasizes how this shift had a profound impact on Japan’s perception of its war responsibility. Under the framework of the San Francisco Peace Treaty system, Hatano objectively analyzes how the Japanese government has handled historical issues and how these responses have fueled diplomatic tensions with neighboring countries.


 Through this lecture, Professor Hatano explores how Japan might overcome its strained relations with neighboring nations entangled in historical disputes, and what steps it must take to move forward.

Full Bio

Hatano Sumio

- Professor Emeritus, University of Tsukuba

- Former Professor, Department of Japanese Politics and Diplomacy, University of Tsukuba

- Director, Asian Historical Records Center; Board member, Military History Society

- Member, Japan Association of International Relations; Asian Political Economy Association

- Chair, Compilation Committee of Japanese Diplomatic Documents (2009present)

- Japanese representative, Japan-China Joint Historical Research (20062009)

- Political Science Committee Member, Science Council of Japan (19951998)

- Recipient of the Yoshida Shigeru Prize (1996)

- Recipient of the Anam Research Encouragement Award (1984)

- Author of 'Japan’s Postwar Historical Issues', 'The San Francisco Peace Treaty System and Historical Issues', 'The Pacific War and Asian Diplomacy'


Hatano Sumio has served as Professor at the Department of Japanese Politics and Diplomacy, University of Tsukuba since 1988 and is now Professor Emeritus. For over 40 years, he has researched Japanese history and international relations, also serving as Political Science Research Committee Member at the Science Council of Japan, and as Chair of the Compilation Committee of Japanese Diplomatic Documents. He has focused on how Japan’s recognition of war responsibility after the Pacific War was formed and transformed. Through his works 'Japan’s Postwar Historical Issues', 'The San Francisco Peace Treaty System and Historical Issues', and 'The Pacific War and Asian Diplomacy', he has pursued the roots of Japan’s conflicts with neighboring countries and critically analyzed the impact of postwar historical perception on international relations.


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