Short answers, pulled from the story.
Thailand, formerly Siam, was the only Southeast Asian state never colonised by a Western power, in part because Britain and France agreed in 1896 to make the Chao Phraya valley a buffer state. Siam survived by ceding territory, trade rights, and legal privileges through several unequal treaties rather than falling to outright conquest.
Siam officially became Thailand on the 24th of June 1939, under the military strongman Plaek Phibunsongkhram. The name change reflected nationalist policies that prioritised the needs of ethnic Thais over minorities like the Thai Chinese.
According to George Coedes, the word Thai means free man in the Thai language, differentiating the Thai from the natives encompassed in Thai society as serfs. Chit Phumisak argued instead that Thai simply means people or human being.
The Ayutthaya Kingdom fell in April 1767, when its walls collapsed after a 14-month siege and the city was burned by Burmese forces. A combined Burmese army of 40,000 had invaded from the north and west in 1765.
General Chao Phraya Chakri founded the Chakri dynasty as Rama I on the 6th of April 1782, after King Taksin and his sons were executed. Rama I established the Rattanakosin Kingdom and moved the capital to Bangkok.
Thailand has had the fourth-most coups in the world and has adopted 20 constitutions and charters since 1932, the latest being the 2017 Constitution. Uniformed or ex-military men led Thailand for 55 of the 83 years between 1932 and 2009.
Thaksin Shinawatra governed Thailand from 2001 until 2006 before being ousted in a coup. His sister Yingluck Shinawatra and later his daughter Paetongtarn Shinawatra both became prime minister, and the Constitutional Court ordered Thaksin's arrest in September 2025.