Thailand

Thailand, officially the Kingdom of Thailand, and formerly known as Siam, is a country located in Mainland Southeast Asia. It shares land borders with Myanmar to the west and northwest, Laos to the east and northeast, Cambodia to the southeast, and Malaysia to the south. Its maritime boundaries include the Gulf of Thailand and the Andaman Sea and shares maritime borders with Vietnam, Indonesia, and India. Thailand has a population of nearly 66 million people and covers an area of approximately 513,115 km2 (198,115 sq mi). The capital and largest city is Bangkok.

Archaeological evidence indicates that humans have inhabited the area for at least 40,000 years. Indigenous ethnic groups include the Mon, Khmer, and Malay people. The Tai people are believed to have originated from the Điện Biên Phủ region since the 5th century and began migrating into the territory of modern Thailand between the 8th and 10th centuries. During the classical historical period, major kingdoms such as Sukhothai, Lan Na, and Ayutthaya were established. The Sukhothai Kingdom is regarded as the beginning of Thai history, while the Ayutthaya Kingdom, founded in 1350 CE, became a regional power replacing the Khmer Empire. European contact began in 1511 when Portuguese envoys arrived in Ayutthaya. The Ayutthaya Kingdom flourished until its complete destruction during the 1765–1767 Burmese–Siamese War by the Burmese forces under the Konbaung dynasty in 1767.

After the fall of Ayutthaya, King Taksin reunified the kingdom and established the Thonburi Kingdom, which lasted only 15 years before he was overthrown by Phutthayotfa Chulalok (Rama I), the founder of the Chakri dynasty. King Rama I established the Rattanakosin Kingdom and moved the capital to Bangkok in 1782. During the era of Western imperialism, Siam remained the only country in Southeast Asia to avoid colonisation by European powers, although it ceded territory, trade rights, and legal privileges through several unequal treaties. The governance system evolved into an absolute monarchy centralised under the rule of King Chulalongkorn (Rama V). Siam adapted to international relations during the imperialist era and joined World War I on the side of the Allies, a political decision aimed at revising the effects of unequal treaties and enhancing Siam's international status.

Following the Siamese revolution of 1932 by the Khana Ratsadon (lit.'People's Party'), Siam transitioned to a parliamentary constitutional monarchy and was officially renamed Thailand. During World War II, the country was under the military dictatorship of Plaek Phibunsongkhram and allied with the Empire of Japan as part of the Axis powers, but Thailand did not become a defeated nation due to the underground Free Thai Movement's "Declaration of Peace", which was recognised by the Allies. During the Cold War, Thailand became a key major non-NATO ally of the United States and played a major role in countering communism in the Korean War, the Vietnam War, and other proxy wars. Thailand also joined the Southeast Asia Treaty Organization (SEATO). In the 1970s through 1990s, Thailand alternated between liberal democracy and military dictatorship.

In the 21 century, Thailand has experienced political conflict between supporters and opponents of Prime Minister Thaksin Shinawatra, leading to the 2006 and 2014 coup d'états. Thailand operates under the 2017 Constitution and a coalition government following the 2019 Thai general election, as well as political demonstrations demanding democracy and monarchy reform. The current constitutional structure allows de facto political influence by the Royal Thai Armed Forces. Thailand has faced border tensions from the 2008–2011 Cambodian–Thai border crisis extending to the 2025 Cambodian–Thai border crisis involving territorial disputes and military clashes.

Thailand is recognised as a developing country and holds significant geopolitical importance in Southeast Asia. It is a unitary state governed under a parliamentary system with a bicameral legislature comprising the elected House of Representatives and the appointed Senate. Thailand is a member of the United Nations, a major non-NATO ally of the United States, and a founding member of the Association of Southeast Asian Nations (ASEAN), as well as a regional power. Thailand's economy is the second-largest in the region and the 23rd globally by purchasing power parity, ranking 29th by gross domestic product. It is classified as a newly industrialised country, with manufacturing, agriculture, and tourism being the main economic sectors.

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