Lan_Chang_province
Lan Chang Province was a former province of the Kingdom of Thailand. It encompassed the eastern slopes of the Luang Prabang Range in Laos, with Xaignabouli (Sainyabuli) as the administrative headquarters. It included parts of former the Luang Prabang and Xaignabouli provinces of French Laos.[2]
Annexed in 1941, Thailand returned it to French Indochina in 1946, along with all other areas it had gained by the war as a condition for admission to the United Nations. Accordingly, all wartime claims against Thailand were dropped and the kingdom received a substantial American aid package in gratitude for the assistance its anti-Japanese underground had provided to the Allied war effort.