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War with Siam and invasion of Cambodia

Minh Mạng also expanded his empire westward, putting central and southern Laos under Cam Lộ Province, and collided with his father's former ally – Siam, in Vientiane and Cambodia. He backed the revolt of Laotian king Anouvong of Vientiane against the Siamese, and seized Xam Neua and Savannakhet in 1827.

In 1834, the Vietnamese Crown fully annexed Cambodia and renamed it to Tây Thành Province. Minh Mạng placed the general Trương Minh Giảng as the governor of the Cambodian province, expanding his forcible religious assimilation to the new territory. King Ang Chan II of Cambodia died in the next year and Ming Mang installed Chan's daughter Ang Mey as Commandery Princess of Cambodia. Cambodian officials were required to wear Vietnamese-style clothing, and govern in Vietnamese style. However the Vietnamese rule over Cambodia did not last long and proved draining to Vietnam's economy to maintain. Minh Mạng died in 1841, whilst a Khmer uprising was in progress with Siamese support, putting an end to the Tây Thành province and Vietnamese control of Cambodia.