Per historical records [specify], Thailand (as Siam) and the Vietnamese state fought together in a massive series of wars that began in the early 18th century.

A massive blow later has Siam being beaten disastrously by the Tay Son force, led by Nguyễn Huệ.

The Siamese and Vietnamese fought two massive wars in the region, resulting in heavy destruction of Cambodia.

After the Vietnamese invasion of Cambodia which resulted in the overthrow of the genocidal Khmer Rouge of Pol Pot’s.

After Nguyễn Văn Linh's 1986 Đổi mới reforms, Vietnam moved from socialism to more integration with the international community.