Kingdom of Thailand

State · 1932–2026 CE · at its largest around 1932 CE

The Southeast Asian kingdom, known as Siam until 1939, which became a constitutional monarchy after the revolution of 1932. Thailand was never colonised by a European power, and its modern politics have seen repeated military coups.

On its lands while it lasted

Pol Pot (1925 CE – 1998 CE): Leader of the Khmer Rouge and of Democratic Kampuchea from 1975 to 1979, whose regime was responsible for the Cambodian genocide.
Burma Railway (1942–1943 CE): Railway between Thailand and Burma built by Japan with forced labour; about 90,000 Asian labourers and 12,000 Allied prisoners of war died building it.
ASEAN founded (1967 CE): Indonesia, Malaysia, the Philippines, Singapore and Thailand founded the Association of Southeast Asian Nations with the Bangkok Declaration of 8 August 1967.
Cambodian genocide (1975–1979 CE): Under Pol Pot's Khmer Rouge, an estimated 1.5 to 2 million Cambodians died from execution, forced labour and starvation.