Thailand -- called Siam before 1939 (and again from 1945-1949) -- is the only south-eastern Asian nation that was never taken over by a European country. This was due to Thailand's strong leadership in the 19th century, and their ability to exploit the rivalry between French Indochina and the British Empire.
Thailand's culture has been influenced by Chinese, Lao, Burmese, Cambodian, and Indian culture. Thailand has a national religion (Theraveda Buddhism) that over 90% of the population profess to be members of.
Thailand is a constitutional monarchy and is considered a newly industrialized country.
Thailand on Wikipedia