Isan people overran the Lao Wang and forced them into corvee (unpaid intermittent labour expected by landowners or monarchs) labour before they were integrated into Isan society; much of Isan was populated this way.
From the late nineteenth century into the 1930s, the Siamese and then Thai states employed diverse means to integrate the people of the former Lao principalities into the Thai state, including military conscription, forced labour, the introduction of Thai provincial administrative systems, the Siamese monarchy, the Siamese religious sangha and Buddhist calendar (as opposed to the Lao sangha and religious calendar or hit sipsong khong sipsii), and a national education system and bureaucracy. 
