11 ATLASES
History of Thailand in maps
Thailand as it appears in 11 interactive history atlases, from 1840 to 2000: Siam, Thailand. Each era below lists who ruled the land and when control changed, linked to the dated map that shows it.
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What was Thailand before it was Thailand? The sections below follow this land through every era covered by the Maps of History atlases: who ruled it, what it was called, and when control changed. Each line links to the dated map. Modern borders serve as an approximation, as each atlas says on the map itself.
Sukhothai & Lan Na (mod. Thailand) · Mongol Empire
| Beyond the conquests — the opening position |
MONGOL EMPIRE: EVERY CHAPTER AND MAP →
Siam (mod. Thailand) · Industrial Revolution
| Opened by force or treaty — the opening position | |
| Opened by force or treaty |
INDUSTRIAL REVOLUTION: EVERY CHAPTER AND MAP →
Siam (mod. Thailand) · Meiji Japan and post-Soviet Russia
| Independent neighbours — the opening position |
MEIJI JAPAN AND POST-SOVIET RUSSIA: EVERY CHAPTER AND MAP →
Siam (mod. Thailand) · Indian independence
Siam alone in southern Asia retained its sovereignty throughout the era. Between British Burma and French Indochina, it used treaty concessions and railway diplomacy to play one power against the other. Renamed Thailand in 1939, it bent with Japan in 1941 and declared war on Britain; its ambassador in Washington famously declined to deliver the declaration. After the war it bent back. The subcontinent’s struggle barely touched it. By modernizing the court, conceding the edges, and keeping the center, Siam followed a road the princely states never found.
| Beyond the Raj · Portuguese & French India — the opening position |
INDIAN INDEPENDENCE: EVERY CHAPTER AND MAP →
Siam · WWI
| The Entente & Allies — the opening position | |
| The Entente & Allies |
Siam (Thailand from 1939) · Chinese Revolution
Siam was the region’s only uncolonized state. A nationalist government renamed it Thailand in 1939 and pursued the lessons it drew from the period: modernize the army and court the strong. After a few hours of resistance in December 1941, Phibun’s regime aligned with Japan and declared war on Britain and the United States. Washington never accepted the declaration. Bangkok ended the war on the winning side, an especially smooth example of a small state surviving between empires.
| Neutral / de-facto independent — the opening position | |
| The Empire of Japan & its puppets | |
| Neutral / de-facto independent |
CHINESE REVOLUTION: EVERY CHAPTER AND MAP →
Siam (mod. Thailand) · Road to WW2
Siam, the region's only uncolonized state, took the name Thailand in 1939. It fought a border war with Vichy Indochina in 1940–41, with Japan acting as arbitrator. On 8 December 1941 Thailand resisted Japanese forces for a few hours, then allowed them passage and entered an alliance within weeks. On the aggressor's doorstep, the small state bent and survived.
| Neutral & unaligned — the opening position | |
| Aggressor clients & partners |
ROAD TO WW2: EVERY CHAPTER AND MAP →
Thailand · WW2
Siam allowed Japanese forces passage and declared war on the Allies. Its ambassador in Washington, however, refused to deliver the declaration. Siam emerged from the war treated as a victim rather than an ally of Japan, a striking result of wartime diplomacy.
| Neutral — the opening position | |
| Axis allies & puppets | |
| Neutral |
Thailand · Cold War
| US-aligned states — the opening position | |
| US-aligned states |
COLD WAR: EVERY CHAPTER AND MAP →
Thailand · Refugee crises
Thailand received Lao, Hmong and Cambodian arrivals from 1975, but its response changed sharply. In June 1979 soldiers forced more than 42,000 Cambodians back at Preah Vihear; that October Thailand opened its border. It adopted “humane deterrence” in 1981 and sheltered Cambodian border camps for a decade. Thailand did not sign the Refugee Convention, leaving these policies to political choice.
| Western bloc or democracy — the opening position | |
| First asylum open | |
| First asylum restricted | |
| First asylum open | |
| First asylum restricted | |
| First asylum open |
REFUGEE CRISES: EVERY CHAPTER AND MAP →
Thailand · Mao’s China
| Beijing’s adversaries — the opening position | |
| Neutral, non-aligned or colonial |
MAO’S CHINA: EVERY CHAPTER AND MAP →
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