Hidekazu Sakai is Associate Professor of Kansai Gaidai University, Japan. His research interests include international relations theory, international security, peacebuilding, and Asian-Pacific politics. His recent publications include Re-rising Japan: Its Strategic Power in International Relations (2017), co-edited with Yoichiro Sato.

• 1. Puzzles 2. Theory and Methodology 3. Emerging Collective Identity: The Persian Gulf War (1990-1991) 4. Nurturing Collective Identity: The September 11 Terrorist Attacks (2001) 5. Cementing Collective Identity: The Tohoku Earthquake (2011) 6. Conclusion: New Understanding on the U.S.-Japan Relationship

Hidekazu Sakai is Associate Professor of Kansai Gaidai University, Japan. His research interests include international relations theory, international security, peacebuilding, and Asian-Pacific politics. His recent publications include Re-rising Japan: Its Strategic Power in International Relations (2017), co-edited with Yoichiro Sato.

• 1. Puzzles 2. Theory and Methodology 3. Emerging Collective Identity: The Persian Gulf War (1990-1991) 4. Nurturing Collective Identity: The September 11 Terrorist Attacks (2001) 5. Cementing Collective Identity: The Tohoku Earthquake (2011) 6. Conclusion: New Understanding on the U.S.-Japan Relationship

Hidekazu Sakai is Associate Professor of Kansai Gaidai University, Japan. His research interests include international relations theory, international security, peacebuilding, and Asian-Pacific politics. His recent publications include Re-rising Japan: Its Strategic Power in International Relations (2017), co-edited with Yoichiro Sato.

• 1. Puzzles 2. Theory and Methodology 3. Emerging Collective Identity: The Persian Gulf War (1990-1991) 4. Nurturing Collective Identity: The September 11 Terrorist Attacks (2001) 5. Cementing Collective Identity: The Tohoku Earthquake (2011) 6. Conclusion: New Understanding on the U.S.-Japan Relationship