In 1941 , it was annexed by Thailand under the name Lan Chang Province , but was returned its pre-war colonial status in 1946 .
In 1904 , Siam was forced to cede the area of the province to the French Indochina colony .
In 1941 , Siam was annexed by Siam under the name Lan Chang Province , but was returned Siam 's pre-war colonial status in 1946 .
In 1904 , Siam was forced to cede the area of the province to the French Indochina colony .