Kingdom of Thailand
The Kingdom of Thailand and formerly known as Siam, is a country at the centre of the Southeast Asian Indochinese peninsula composed of 76 provinces. Tai peoples migrated from southwestern China to mainland Southeast Asia from the 11th century. Various kingdoms such as the Mon kingdoms, Khmer Empire and Malay states ruled the region, competing with Thai states such as the Kingdoms of Ngoenyang, Sukhothai, Lan Na and Ayutthaya, which rivaled each other. Documented European contact began in 1511 with a Portuguese diplomatic mission to Ayutthaya. Following a bloodless revolution in 1932, Siam became a constitutional monarchy and changed its official name to "Thailand".