Thailand

Thailand,, ; , , }} officially the Kingdom of Thailand,; }} and formerly known as Siam until 1939,, ; , , ; also spelled ''Siem'', ''Syâm'', or ''Syâma''}} 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, as well as maritime borders with Vietnam, Indonesia, and India. Thailand has a population of nearly 66 million people, covers an area of approximately 513,115 km² (198,115 sq mi). The country's capital and largest city is Bangkok.

Archaeological evidence indicates that humans have inhabited the area of present-day Thailand 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 origin of the Tai people. 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 CE 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 colonization by European powers, although it ceded territory, trade rights, and legal privileges through several unequal treaties. The governance system evolved into an absolute monarchy centralized 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 (), Siam transitioned from an absolute monarchy 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 recognized 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). Despite brief periods of liberal democracy in the 1970s and 1990s, Thailand alternated between liberal democracy and military dictatorship.

Since the 2000s, Thailand has experienced political conflict between supporters and opponents of Prime Minister Thaksin Shinawatra (in office 2001–2006), leading to the 2006 and 2014 coup d'états. Today, 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 still allows ''de facto'' political influence by the Royal Thai Armed Forces. Thailand has also faced border tensions from the 2008–2011 Cambodian–Thai border crisis extending to the 2025 Cambodia–Thailand border crisis involving territorial disputes and military clashes.

Currently, Thailand is recognized 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. The Royal Thai Armed Forces are among the largest military forces in Southeast Asia. Thailand's economy is the second-largest in the region and the 23rd globally by purchasing power parity, ranking 29th by gross domestic product. Thailand is classified as a newly industrialized country, with manufacturing, agriculture, and tourism being the main economic sectors. Provided by Wikipedia