For 10 points, name this country, the only Southeast Asian state to avoid being colonized, which was once known as Siam.
An army from what is now this country ended the expansion of the Toungoo dynasty at the Battle of Nong Sa Rai. In 1932, its People's Party seized power from this country's king under the Promoters Revolution. Its current line of kings came to power after the insane Taksin was deposed by the first ruler of the Chakri Dynasty. It has since been ruled by nine kings named Rama and endured another eighteen military coups. For 10 points, name this country, the only Southeast Asian state to avoid being colonized, which was once known as Siam.
An army from what is now this country ended the expansion of the Toungoo dynasty at the Battle of Nong Sa Rai.
{Thailand} [accept {Siam} before it is read]