The word Siam (Thai: สยาม RTGS: Sayam) may have originated from Pali (suvaṇṇabhūmi, "land of gold"), Sanskrit श्याम (śyāma, "dark"), or Mon ရာမည (rhmañña, "stranger"), with likely the same root as Shan and Ahom.
[6][7][8][9] The site of Ban Chiang (around Udon Thani Province) currently ranks as the earliest known center of copper and bronze production in Southeast Asia and has been dated to around 2,000 years BCE.
[24][failed verification] A council was established to govern the kingdom for a while, and then a local Wa man known as Lavachakkaraj was elected king of the new city of Chiang Saen or Ngoenyang.
By 1100 CE, the Tai had established themselves as Po Khuns (ruling fathers) at Nan, Phrae, Songkwae, Sawankhalok, and Chakangrao on the upper Chao Phraya River.
[26] Philippines-Thailand relations already had precursors in that, Thailand often exported ceramics to several Filipino states as evidenced that when the Magellan expedition landed at the Cebu Rajahnate, they noted a Thai embassy to the king, Rajah Humabon.
Initially based at Chanthaburi in the southeast, within a year he had defeated the Burmese occupation army and re-established a Siamese state with its capital at Thonburi on the west bank of the Chao Phraya, 20 km from the sea.
Prince Thepphiphit, King Boromakot's son, who had been unsuccessful in a diversionary action against the Burmese in 1766, had set himself up as the ruler of Phimai holding sway over the eastern provinces including Nakhon Ratchasima or Khorat.
In the southern provinces as far north as Chumphon, a Pra Palad who was the acting Governor of Nakhon Si Thammarat declared his independence and raised himself to a princely rank.
In particular, British traders such as Robert Hunter ("discoverer" of the conjoined brothers Chang and Eng, the original "Siamese twins") or James Hayes, but also missionaries from Europe and the United States like Jacob Tomlin, Karl Gützlaff, Dan Beach Bradley and Jean-Baptiste Pallegoix became active in Siam.
Mongkut and his successor Chulalongkorn (Rama V) recognised this situation and tried to strengthen the defence forces of Siam by modernisation, to absorb Western scientific and technical achievements, thus avoiding colonisation.
A major event was the Paknam incident, when, on 13 July 1893, French cannon boats entered the Chao Phraya River toward Bangkok and were fired upon from a Siamese coastal fort, leading to the Franco-Siamese crisis.
After the French crisis of 1893, King Chulalongkorn realised the threat of the western colonial powers, and accelerated extensive reforms in the administration, military, economy and society of Siam, completing the development of the nation from a traditional feudalist structure based on personal domination and dependencies, whose peripheral areas were only indirectly bound to the central power (the King), to a centrally-governed national state with established borders and modern political institutions.
For example, the Gregorian Calendar was introduced, all the citizens of his country had to accept Family names, women were encouraged to wear skirts and long hair fringements and a citizenship law, Principle of the "Ius sanguinis" was adopted.
Siam's token participation in World War I secured it a seat at the Versailles Peace Conference, and Foreign Minister Devawongse used this opportunity to argue for the repeal of the 19th-century unequal treaties and the restoration of full Siamese sovereignty.
[44] A small circle from the rising bourgeoisie of former students (all of whom had completed their studies in Europe – mostly Paris), supported by some military men, seized power from the absolute monarchy on 24 June 1932 in an almost nonviolent revolution.
Fearing that Pridi's liberal wing, who had the majority in the National Assembly, would decide to take action, Phraya Manopakorn dissolved the parliament in April, imposed an emergency, and rescinded the constitution, which had not yet been a year old.
At the same time, the nationalist group led by Phibunsongkhram strengthened in the People's Party, oriented to the totalitarian ideas of Italy, Germany, Japan, but also the "young Turks" (Kemal Atatürk).
The many unsettled constitutional roles of the crown and the dissatisfaction with Khana Ratsadon, especially Pridi's post in the new government, culminated in October 1933 in a reactionary Boworadet Rebellion staged by royalist factions.
Pridi Phanomyong was appointed acting regent for the absent King Ananda Mahidol, while Direk Jayanama, the prominent foreign minister who had advocated continued resistance against the Japanese, was later sent to Tokyo as an ambassador.
As Japan neared defeat and the underground anti-Japanese resistance Seri Thai steadily grew in strength, the National Assembly forced out Phibun.
In early September the leading elements of Major General Geoffrey Charles Evans's 7th Indian Infantry Division landed, accompanied by Edwina Mountbatten.
In 1946, after he agreed to hand back the Indochinese territories occupied in 1941 as the price for admission to the United Nations, all wartime claims against Siam were dropped and substantial US aid was received.
A State Department policy statement in 1950 noted that 'effective resistance to Communism must be based on widespread public support within the country' and set out that Thailand would receive a payment of $10,000,000 in aid.
[59] US Vietnam-era veterans whose service involved duty on or near the perimeters of military bases in Thailand anytime between 28 February 1961, and 7 May 1975, may have been exposed to herbicides and may qualify for VA benefits.
[60] A declassified US Department of Defense report written in 1973 suggests that there was a significant use of herbicides on the fenced-in perimeters of military bases in Thailand to remove foliage that provided cover for enemy forces.
With US dollars pumping up the economy, the service, transportation, and construction industries grew phenomenally as did drug abuse and prostitution, which using Thailand as a "Rest and Recreation" facility by US forces.
An hour later, the king appeared on national television, asking for calm, and announcing that Field Marshal Thanom Kittikachorn had been replaced with Dr. Sanya Dharmasakti, a respected law professor, as prime minister.
The 1973 Uprising brought about the most free era in Thai recent history, called an "age when democracy blossomed" and a "democratic experiment," which ended in the Thammasat University massacre and a coup on 6 October 1976.
While he was in New York for a meeting of the UN, Army Commander-in-Chief Lieutenant General Sonthi Boonyaratglin launched the bloodless September 2006 Thailand military coup d'état supported by anti-Thaksin elements in civil society and the Democrat Party.
On the night of 1 December 2016, the fiftieth day after the death of Bhumibol, Regent Prem Tinsulanonda led the heads of the country's three branches of government to an audience with Vajiralongkorn to invite him to ascend to the throne as the tenth king of the Chakri dynasty.