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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
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        • Who Fought in the China-Burma-India Theater?
        • The Second Sino Japanese War
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        • Operation U-Go
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The Thai-Japanese Relationship

Picture
Portrait of Inagaki Manjiro (稲垣満次郎, 1861 – 1908)
Early Thailand and Japanese contact can be traced to the 15th century. The two country’s early interactions were transactional in nature, ultimately boiling down to trade and overseas cultural missions. One official who really sparked the charge for extensive Japanese-Thai alliance was Inagaki Manjiro, the General Secretary of the Oriental Association (Tōyō Kyōkai). After the successful invasion and capture of Manchuria (Manchukuo) in 1895, Inagaki promoted the idea of creating a sphere of influence in the Pacific. In particular, Inagaki sought to create a diplomatic defense in the region and lobbied the Japanese government to establish relations with Siam. He was chosen to represent Japan at the foreign conference, including an 1897-1898 negotiation regarding extraterritoriality rights. 

Power Struggle between Phibun and Pridi
The 1932 coup d'état transformed the fabric of Thai society, replacing the system of Absolute Monarchy with a Constitutional Monarchy and introducing the country to its very first constitution. Despite tremendous accomplishments, the Promoters split due to alienating ideological differences with Phibun leading the military faction and Pridi leading the civilian faction. Unfortunately, Pridi’s ideas were soon deemed communist. The National Assembly was soon dissolved and Pridi was forced into exile. While retreating to France, Pridi’s polar opposite and political foil, Phibun, rose to prominence.

Phibun led a second successful coup in June 1933 and quashed the October 1933 Boworadet rebellion led by royalist Prince Boworade and his allies. Phibun emerged as a Thai national hero and by 1938, assumed the position of both Prime Minister and Commander of the Royal Siamese Army.
Picture
Photo of Pridi Banomyong (Left) and Plaek Phibunsongkhram (Right)

The Vote
Thailand’s unexpected international response to Japan’s seizure of Manchuria proved to be a pivotal event in building future Thai-Japanese relations. 

The United States terminated the 1902 Ango-Japanese alliance and effective banned Japanese immigration through the enactment of the 1924 National Origins Act, also known as the Japanese Exclusion Act. Such discriminatory legislation defined the turning point of U.S.-Japanese relations, with feelings of frustration, betrayal, and humiliation transforming into a physical assault on U.S. territory with the attack on Pearl Harbor several years later.

The effects of the Great Depression and the Great Kanto Earthquake of 1923 plunged Japan through a series of both political and financial instabilities. The results of this instability giving rise to the strength of financial conglomerates known as zaibatsus (財閥), who would later go to fund Japan’s military-industrial complex during the war.

With both external pressures from Western foreign policies as well as internal pressures from continuously growing ultranationalist campaigns, Japan soon found itself pursuing the expansionist route. Feeling alienated from the world, Japan shifting its focus from isolationism to full-on invasion.

Japan soon launched an attack against China known as the Mukden Incident (beginning on September 18, 1931), proceeding with a full invasion of Manchuria six months later. In February 1933, a vote was held in the League of Nations to condemn the Japanese occupation of Manchuria. In protest, the Japanese delegation walked out of the room. The only country that chose to abstain, was Thailand. While arguably the decision seemed to stem from Thailand’s wish to stay neutral, the act served as a symbol of solidarity for the Japanese.

Phibun capitalized on this conviction. Through political strategy, he used growing Japanese interest in Thailand as leverage against the U.S. and Britain, who were insistent that Thailand not yielding to Japanese advances. Under the leadership of Ambassador Sir Josiah Crosby (served 1934–1941), Britain built stronger ties with Siam and competed against the Japanese for influence in Bangkok. Utilizing this newly found leverage, Thailand convinced the British to surrender extraterritoriality in Siam as well as other previously held privileges. Further playing on the opposing countries' anxieties, Phibun fabricated and exaggerated threats of ‘pro-Japanese’ or ‘pro-British’ alliances that threatened to overthrow Thailand’s political order. Towards the British and French, Phibun exaggerated stories of inducements offered by the Japanese, such as their willingness to grant Thailand areas of Laos and Cambodia should the Japanese conquer Indochina. Towards the Japanese, Phibun commented on tempting treaties proposed by the two Western states.

The Concessions
To Phibun, and the military faction as a whole, reclaiming and restoring formerly lost territories was part of a broader nationalist plan. Other components of Phibun’s nationalism included popularizing traditional Thai culture (including attire, songs, and traditional dance), declaring Thai as the official language, and reverting the country’s name from Siam to Thailand. In other words, he sought to unite the country under a singular custom, tradition, and faith. 

In the wake of French capitulations by the hands of the Germans, Phibun and irredentist jumped on the opportunity to lay claims for concessions. Phibun launched an invasion of the French vassal state territories in early October 1940, an event which would become known as the Franco-Thai War (กรณีพิพาทอินโดจีน). While the swift action to conquer the territories can be seen as Phibun’s desire to promote his nationalist agenda, an even more important reason was Thailand’s refusal to have the territories fall into Japanese hands. 
Picture
The provinces ceded from Cambodia by France to Thailand were regrouped into new Thai provinces, Phra Tabong, Phibunsongram, and Nakhon Champassak.
By Murashel, edited by: Thanyakij - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=26562498
As part of their plan, Thailand then shifted its energy towards the Japanese. In February 1941, Phibun claimed his administration was on the verge of being ousted by a “pro-British” faction and called for Japanese assistance in supporting Thailand’s claim for concessions. In reality, the British were recovering from the loss of over 68,000 men during the French campaign, signing lend-lease agreements with the U.S. due to the depletion of their liquid currency, and experiencing the loss of their Thai foreign minister due to Sir Josiah Crosby’s resignation.

Japan responded through mediating negotiations between Thailand and the French. On March 11, 1941, Japan hosted a conference in Saigon, Vietnam, brokering a deal requesting a ceasefire between France and Thailand near the vassal state territories. The ceasefire was signed on January 31, 1941. 

Only several years later did the Japanese realize they were part of Thailand’s puzzle all along. 

Ultimate Decisions
By 1939, the Axis Powers had acquired significant territory. The Germans had captured Czechoslovakia, Italy had begun occupying Albania, and Japan had successfully seized control of both the Hainan and Spratly Islands. By September, the Germans launched a full-fledged assault against Poland, causing both France and Britain to declare war.

At this point, Thailand sought to reach out to the Allies for assistance. Unfortunately, this call for aid was rejected as Britain they had their hands tied in Europe and lacked both the will and power to fend off Japanese advancement in Asia. Exhausting their options for Western assistance, Phibun realized that the best option to prevent a bloodbath and complete occupation of their country was to side with the Japanese.

December 8, 1941, at 2:00 am, less than two hours after the attack on Pearl Harbor, the Japanese landed on the shores of southern Thailand. Five hours after the first landing, Phibun rushed back to Bangkok for the government Cabinet meeting. By noon, Phibun called for a ceasefire for the sake of negotiating with the Japanese. 
Map of Japanese invasion
Map of the Japanese Invasion of Thailand on December 8, 1941
​By No machine-readable author provided. Pi@k~commonswiki assumed (based on copyright claims). - No machine-readable source provided. Own work assumed (based on copyright claims)., CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=1827170
On December 9, 1941, an agreement was reached between Thailand and Japan. The following provisions were summarized by Thawi Bunyakeyt:
  • The Thai government permitted Japan to send troops through Thailand to other countries in the region, notably, Malaya and Burma.
  • The Japanese troops would not disarm Thai forces.
  • Japanese forces would only pass through, no remain in, Bangkok.
  • The agreement was only military in nature and did not imply a political or military alliance. No further requirements were to be levied on Thailand.

On January 25, 1942, Bangkok declared war on the United States and the United Kingdom. Under Thai Law, all members of the Council of Regents were required to sign laws and declarations issued in the name of the King. The declaration was returned to Phibun with only two signatures. Thai minister M.R. Seni Pramoj refused to give the war declaration to Secretary of State Cordell Hull, an act that was deemed “one of the most dramatic causes of the continued American friendship for Thailand”. In response to the declaration, the British declared war on Thailand and deemed the country an enemy of the state. 

Under military and political pressure from Japan, Thailand had officially entered the war. Little did Phibun, Japan, and the Allies know, was that the first attempt to organize an underground resistance was made seconds after the war declaration had been made.
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SIAMESE SOVEREIGNTY
Thailand’s Political Duality During World War II

Beginning in the l800s, Asian nations were gradually falling under European rule. Yet despite Europe’s growing military, economic, and political dominance in the Eastern hemisphere, one country prevailed as the sole nation untouched by colonialism; Thailand (then known as Siam). Under difficult yet unprecedented circumstances, Thailand maintained its sovereignty. Their biggest challenge would come twenty years later, with the introduction of World War II.

Siamese Sovereignty explores a variety of anecdotes that epitomize Thailand’s experiences during the second great war, from the conception of Thai-Japanese and Thai-U.S. relations, the epic rescue of a captured Flying Tiger pilot, to the hardships endured by prisoners of war during the construction of the Thai-Burma Railway. Most importantly, the book speaks to the brilliance of both domestic and international political strategies orchestrated both by the Thai government led by Field Marshal Plaek Phibunsongkhram and the Underground Movement led by Pridi Banomyong. Despite siding with opposing global alliances, Phibun with the Axis and Pridi with the Allies, their strive to protect Thailand’s independence amidst the chaos that was World War II was at the heart of their independent decision-making.

Thailand’s story during the second great war is not one that is filled with heroic military battles or technological innovation, but rather, it is a unique narrative of carefully planned political maneuvering that included strategies of selective disengagement, territorial compromise, and most prominently, political duality. Appealing to the Japanese expansionist ambitions on the surface while working with U.S. and British intelligence underground, the country fought to preserve its sovereignty, cementing its legacy as the only independent Southeast Asian nation in a world run by imperialism.​


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Phibun's Policies
Background image: Precision bombing by Boeing B-29s caused this damage to the VI Bridge, at Bangkok, Jap-occupied Thailand over the Chao Bhraya river​
Source: https://www.flickr.com/photos/13476480@N07/23594169263/in/photostream/
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      • 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
    • 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
Contribute