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        • Human Experimentation
        • [GRAPHIC] Germ Warfare Attacks
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        • [OLD] Cover Ups After the War
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        • Philippines World War II Timeline
        • The Japanese Invasion & Conquest of the Philippines
        • Bataan Death March
        • Formation of Underground Philippines Resistance
        • Supplies of the Guerrilla Fighters
        • The Hukbalahap
        • Hunter's ROTC
        • Marking's Guerrillas
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        • Singapore World War II Timeline
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        • Japan's Invasion of the Malay Peninsula
        • Sook Ching Massacre
        • Double Tenth Incident
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        • Voices from Syonan
        • Return to British Rule
      • Three Years and Eight Months - Guide >
        • Hong Kong before WW2
        • Buildup to World War 2
        • The Battle of Hong Kong
        • Life during 3 Years and 8 Months
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      • The Khabarovsk War Crimes Trial - Guide >
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        • The Japanese Empire and USSR in WW2
        • The Employment of the Bacteriological Weapon in the War
        • Planning of Japan invasion to USSR
      • Unit 731 Cover-up : The Operation Paperclip of the East - Guide >
        • Establishing Manchukuo
        • The Development of Unit 731
        • Plan Kantokuen and Bacteriological Warfare
        • The Downfall of the Japanese WW2 Era
        • Three Stages of Interrogations
        • Lasting Impacts
      • Marutas of Unit 731 - Guide >
        • How did Ishii Shiro start unit 731?
        • A Beta Testing Site
        • Establishing Pingfan
        • Experiences at the Human Experimentation Complex
        • Vivisection at the Unit 731
        • Anta Testing Grounds
        • Overall Advance from the Laboratory Creations
        • The End of the War
      • Prince Konoe Memoir - Guide >
        • Who is Prince Konoe?
        • Preparation to Tripartite Pact
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        • The End of Prince Konoe
      • Competing Empires in Burma - Guide >
        • What was the China-Burma-India Theater?
        • When did the China-Burma-India Theater Happen?
        • Who Fought in the China-Burma-India Theater?
        • The Second Sino Japanese War
        • Japan in the South
        • Operation U-Go
      • Battle of Shanghai - Guide >
        • The Battle of Shanghai. Background
        • Shanghai Before War
        • The First Battle of Shanghai 1932
        • Battle of Shanghai 1937
        • Aftermath of Battle for Shanghai
      • Ishi Shiro - Guide >
        • History of Biological Weapons and The Young Ishii Shiro
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      • Taiwan The Israel of the East - Guide >
        • Background of Formosa
        • Industrialization of Japan
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      • Seeking Justice for Biological Warfare Victims of Unit 731 - Guide >
        • Introduction of Wang Xuan
        • Colonel Memorandum
        • The Beginning of Biological Warfare
        • The Bacteriological Warfare on China
        • Victims in Zhejiang’s Testimonies
        • After the War
      • Rice and Revolution - Guide >
        • The French Colonial Period
        • Anti-Colonial Resistance
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        • Imperial Japan’s Entry into Indochina
        • The Portents of Famine
        • The Famine (1944-45)
        • Legacy of the 1944-45 Vietnam Famine
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        • Japan’s Imperialist Origins
        • Japan’s Competition against the West: Nanshin-ron and Hokushin-ron
        • Japanese Imperialism Through the Lens of French Indochina
        • The U.S.-Japan Relations and the Pearl Harbor Attack
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        • The Influence of War Rations on Post-War Culinary Transformations
        • How World War II Complicated Food Scarcity and Invention
        • American Military Innovations
        • Government-Sponsored Food Inventions in Europe during World War II
        • Feeding the Army: The Adaptation of Japanese Military Cuisine and Its Impact on the Philippines
        • Mixed Dishes: Culinary Innovations Driven by Necessity and Food Scarcity
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        • Brief Overview of Imperial Japan
        • Defining Propaganda
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        • Youth and Education
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        • The Aftermath of the Bombings
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Why Did Japan Attack So Many Southeast Asian Countries in World War II?

7/14/2020

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by Quin Cho
Picture
Japan’s “Meiji Restoration”—which spelled the end of the country’s isolation from the West during the reign of the Tokugawa Shoguns--allowed it to embark upon a campaign of modernization and westernization. Within the scope of a few decades, Japan modernized and became the most powerful country in East Asia, with that result cemented in blood by the First Sino-Japanese War and the Russo-Japanese War. Thereafter, Japan decided to emulate the Western Powers that colonized or subdued most of the non-Western world in the nineteenth and early twentieth centuries; in other words, Japan became an imperial power in East Asia. It annexed Formosa (Taiwan) in 1895, Korea in 1910, and the Caroline and Mariana Islands after World War I. 
(continued) Field officers (Colonels Kanji Ishiwara and Seishiro Itagaki) in the Kwantung Army—a hotbed of right wing ultra-nationalism—then capitalized on China’s period of semi-colonial, semi-feudal weakness to seize Manchuria, in the hopes that this would provide Japan with coal, iron ore, grain, and surplus land (Pike, 142 and Beevor, 7). Unfortunately for the Japanese, the seizure of Manchuria did not resolve any of Japan’s many economic and social problems in the midst of the Great Depression. Right-wing ultra-nationalism became popular in the officer corps, and a strange concoction of right-wing assassinations, attempted coups, and political fecklessness led to the demise of Japanese parliamentary democracy. Partially as a result of the increasing influence of the militarists, the Japanese Imperial General Staff decided to invade China, in the hopes that the country could be defeated swiftly and therefore be a reserve of foodstuffs and raw materials. ​

Despite initial Japanese operational success in China, the Japanese failed to deliver a decisive blow to the Chinese forces in the field and defeat China in 6 months. By 1939, the Japanese advance had almost completely stalled due to poor logistics and newfound operational failures (notably at the 1
st Battle of Changsha). Furthermore, Japan had limited remaining supplies of two vital raw materials—rubber and tin—to continue the war in China (rubber being necessary for vehicle tires, and tin being necessary for cans to prevent rations from spoiling, among other things). This reality—combined with defeat at the hands of the Soviets during the Battle of Khalkhin Gol and the destruction of the 23rd Infantry Division—led to the “Strike South” faction (Nanshin-ron) that wanted to attack Southeast Asia winning out against the “Strike North” faction (Hokushin-ron) that wanted to attack the Soviet Union. Those advocating Nanshin-ron sought to capture the European and American Southeast Asian colonial possessions—namely the Dutch East Indies, Malaysia, Burma, French Indochina, the Philippines, and—and their reserves of raw materials. These included rubber, tin, cobalt, tungsten, oil, and foodstuffs, among other things. Therefore, after the fall of France in June 1940, the Japanese procured rights to naval and air bases in French Indochina from the newly founded Vichy French government. The acquisition of French Indochina would allow the Japanese to have a base of operations to strike the Dutch East Indies, Malaysia, Thailand. Additionally, Indochina also served as a massive reservoir of rice to be exported to Japan.
​

The Americans felt that Japanese aggression against China and French Indochina was a direct threat to their economic interests in the region (namely the “Open Door Policy” with regards to China). Therefore, the US froze all Japanese assets in the US after the Japanese established bases in Indochina (which prevented them from buying vital materials such as copper and scrap iron), and then imposed an oil embargo. At this point, Japan was not only short of tin and rubber, but would soon rapidly have to face the reality of dwindling oil stockpiles. The American conditions for a removal of the embargo hinged upon a withdrawal of Japanese forces from China and Indochina. These proposals were rejected, however, as by this point the war in China had been glorified to the Japanese public and was a source of legitimacy to the right-wing militarists in charge of the country in 1941. The decision to continue the war in China therefore necessitated the seizure of the Netherlands East Indies, which had a variety of raw materials (most notably oil), British Malaya (with its tin and rubber), the Philippines (which were in the way and could serve as a US base to interdict Japanese operations in Malaya and the Dutch East Indies), and British controlled Burma, among other places. The Japanese Imperial General Staff opted to initiate near-simultaneous amphibious landings in Malaya, Thailand (on the Kra Isthmus) the Philippines, Hong Kong, Guam, Wake Island, and the various islands in the Dutch East Indies in December 1941 and January 1942 due to the position of the moon and tides (which influences when amphibious landings can take place). The necessity of destroying US Pacific Fleet at Pearl Harbor and its capacity to partake in the war in a surprise attack was also agreed upon. By September 1941, the die was cast: Nanshin-ron was the way forward, and the war in the Asia-Pacific was to expand into Southeast Asia.

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  • Home
    • About >
      • FAQ's - Frequently Asked Questions
    • Support Us >
      • Projects you can support! >
        • Distributing Books
        • Presenting at 112th Annual Meeting of Pacific Coast Branch
        • Summer Research Relocation Fund
    • Contact
  • Stories
    • Videos >
      • Black Hearts (2021)
    • Blog
    • Podcast: Forgotten History
  • Internship
    • Summer 2025 Internship
    • Spring 2025 Internship
    • Summer 2024 Internship
    • Summer 2023 Internship
    • Fall 2022 Internship
    • Summer 2022 Internship
    • Summer 2021 Internship
    • Fall 2020- Spring 2021 Internship
    • Summer 2020 Internship
    • Fall 2019 Internship
    • Summer 2019 Internship >
      • Public History Night
    • School Year 2018-2019 Internship
    • Summer 2018 Internship >
      • 2018 Summer Showcase + Fundraiser
    • Fall 2017 Internship
    • Summer 2017 Internship >
      • 2017 Summer Showcase & Fundraiser
  • Books
  • Archives
  • Resource Page
    • Supplementary Research Guides >
      • Unit 731 - Guide >
        • Background of Biochemical Warfare Development
        • Imperial Japan's Chemical Warfare Development Program
        • Map of Unit 731
        • Personnel of Unit 731
        • Duties of Unit 731
        • Human Experimentation
        • [GRAPHIC] Germ Warfare Attacks
        • Cover Ups After the War
        • [OLD] Cover Ups After the War
      • Philippines' Resistance - Guide >
        • Philippines World War II Timeline
        • The Japanese Invasion & Conquest of the Philippines
        • Bataan Death March
        • Formation of Underground Philippines Resistance
        • Supplies of the Guerrilla Fighters
        • The Hukbalahap
        • Hunter's ROTC
        • Marking's Guerrillas
        • United States Army Forces in the Philippines of Northern Luzon (USAFIP-NL)
        • The Aetas
        • Chinese and Filipino-Chinese Nationalist Guerrilla Units
        • The Female Faces of the Philippine Guerrillas
      • Rising Sun Flag - Guide >
        • History of the Rising Sun Flag
        • Atrocities Committed Under the Flag
        • Rising Sun Flag in Pop Culture
      • Pinay Guerrilleras - Guide >
        • Japanese Occupation of the Philippine Islands: Pinays Answering the Call to Arms
        • The Fierce Heneralas and Kumanders of the Hukbalahap Guerrillas
        • Amazons of the Pacific Theater
        • Filipina American Veterans: Recovering the Extraordinary Feats of the Ordinary Pinays
        • The Legacy of the Asian Women Soldier
      • Fall of Singapore - Guide >
        • Singapore World War II Timeline
        • History of World War II in the Pacific
        • History of Singapore
        • Japan's Conquest in Asia
        • Japan's Invasion of the Malay Peninsula
        • Sook Ching Massacre
        • Double Tenth Incident
        • Social Changes and Challenges in Singapore
        • Voices from Syonan
        • Return to British Rule
      • Three Years and Eight Months - Guide >
        • Hong Kong before WW2
        • Buildup to World War 2
        • The Battle of Hong Kong
        • Life during 3 Years and 8 Months
        • East River Column Guerrilla Fighters
        • Prisoners of War Camps
        • End of Japanese Occupation
        • War Crimes Trials
      • Siamese Sovereignty - Guide >
        • The Land of Smiles
        • The Thai-Japanese Relationship
        • Phibun’s Domestic and International Policies
        • The Free Thai Resistance Movement
        • Post WW2 Aftermath of Thailand
      • The Khabarovsk War Crimes Trial - Guide >
        • Defendants of Khabarovsk War Crime
        • The Japanese Empire and USSR in WW2
        • The Employment of the Bacteriological Weapon in the War
        • Planning of Japan invasion to USSR
      • Unit 731 Cover-up : The Operation Paperclip of the East - Guide >
        • Establishing Manchukuo
        • The Development of Unit 731
        • Plan Kantokuen and Bacteriological Warfare
        • The Downfall of the Japanese WW2 Era
        • Three Stages of Interrogations
        • Lasting Impacts
      • Marutas of Unit 731 - Guide >
        • How did Ishii Shiro start unit 731?
        • A Beta Testing Site
        • Establishing Pingfan
        • Experiences at the Human Experimentation Complex
        • Vivisection at the Unit 731
        • Anta Testing Grounds
        • Overall Advance from the Laboratory Creations
        • The End of the War
      • Prince Konoe Memoir - Guide >
        • Who is Prince Konoe?
        • Preparation to Tripartite Pact
        • Emperor Hirohito and Prince Konoe
        • The End of Prince Konoe
      • Competing Empires in Burma - Guide >
        • What was the China-Burma-India Theater?
        • When did the China-Burma-India Theater Happen?
        • Who Fought in the China-Burma-India Theater?
        • The Second Sino Japanese War
        • Japan in the South
        • Operation U-Go
      • Battle of Shanghai - Guide >
        • The Battle of Shanghai. Background
        • Shanghai Before War
        • The First Battle of Shanghai 1932
        • Battle of Shanghai 1937
        • Aftermath of Battle for Shanghai
      • Ishi Shiro - Guide >
        • History of Biological Weapons and The Young Ishii Shiro
        • Establishment in Manchuria
        • Pingfang District - Harbin
        • Failures and Corruption
        • Post War
      • Taiwan The Israel of the East - Guide >
        • Background of Formosa
        • Industrialization of Japan
        • China During WWII
        • Taiwan under Kuomintang
        • New Taiwanese National Identity
      • Seeking Justice for Biological Warfare Victims of Unit 731 - Guide >
        • Introduction of Wang Xuan
        • Colonel Memorandum
        • The Beginning of Biological Warfare
        • The Bacteriological Warfare on China
        • Victims in Zhejiang’s Testimonies
        • After the War
      • Rice and Revolution - Guide >
        • The French Colonial Period
        • Anti-Colonial Resistance
        • The Rise of the Communist Movement
        • Imperial Japan’s Entry into Indochina
        • The Portents of Famine
        • The Famine (1944-45)
        • Legacy of the 1944-45 Vietnam Famine
      • Clash of Empires - Guide >
        • Japan’s Imperialist Origins
        • Japan’s Competition against the West: Nanshin-ron and Hokushin-ron
        • Japanese Imperialism Through the Lens of French Indochina
        • The U.S.-Japan Relations and the Pearl Harbor Attack
      • Hunger for Power and Self-SufficiencyI - Guide >
        • The Influence of War Rations on Post-War Culinary Transformations
        • How World War II Complicated Food Scarcity and Invention
        • American Military Innovations
        • Government-Sponsored Food Inventions in Europe during World War II
        • Feeding the Army: The Adaptation of Japanese Military Cuisine and Its Impact on the Philippines
        • Mixed Dishes: Culinary Innovations Driven by Necessity and Food Scarcity
      • Denial A Quick Look of History of Comfort Women and Present Days’ Complication - Guide >
        • The Comfort Women System and the Fight for Recognition
        • The Role of Activism and International Pressure
        • The Controversy over Japanese History Textbooks
        • The Sonyŏsang Statue and the Symbolism of Public Memorials
        • Activism and Support from Japanese Citizens
        • The Future of Comfort Women Memorials and Education
      • Echoes of Empire: The Power of Japanese Propaganda - Guide >
        • Brief Overview of Imperial Japan
        • Defining Propaganda
        • Propaganda Encouraging Action​
        • The Rise of Nationalism
        • The Formation of Japanese State Propaganda
        • Youth and Education
      • Shadows of the Rising Sun: The Black Dragon Society and the Dawn of Pan-Asianism - Guide >
        • Origins of the Black Dragon Society
        • The Influence of Pan-Asianism
        • Relationship with Sun Yat-sen
        • The Role in Southeast Asia
        • The Spread of Ideology and Espionage
        • Disbandment and Legacy
      • Chongqing Bombing: The Forgotten Blitz of Asia and Its Lasting Impact - Guide >
        • Introduction and Historical Background
        • The Class Divide During the Bombings
        • Resilience and Unity of Chongqing
        • Key Incidents - Great Tunnel Massacre
        • The Aftermath of the Bombings
        • Legacy and Commemoration
      • Shanghai's International Zone: A Nexus of War, Intelligence, and Survival - Guide >
        • Historical Background
        • The International Zone
        • Battles in Shanghai
        • Civilian Intelligence Efforts
        • Wartime Brutality
        • Aftermath & Legacy
    • Lesson Plans >
      • Reparations
      • Ethics in Science
      • Writing the Narrative of a Pinay Fighter
      • Privilege Journal
      • Environmental Injustices
      • Female Guerrillas
      • Hunter's ROTC
      • Scientific Advancements
      • Seeking Justice: A Humanities Lesson Plan
      • The Hukbalahap
      • Trading Immunity
      • Bataan Death March
      • Biochemical Warfare Development
  • History Remembered
Contribute