At the end of the 19th century, Siam was remade as a nation-state. The ‘nation’ constructed by this process was novel. The areas collected within the borders had very different histories, languages, religious cultures, and traditions. The Thai language seems to have been spoken in the lower Chao Phraya system and down the upper peninsula, but in practice local dialects varied greatly, and the languages of Bangkok and Chiang Mai were mutually unintelligible. Over the prior century, the expansion of Bangkok's political influence, the influx of war captives, and Chinese immigration had added to the social variety. The fragmentation of the administration gave scope for local difference.

The ideas of nation, unified nation-state, nationality, national identity, and centralized nation-governing bureaucracy were imposed from above. They were adapted from European models, and adopted in part to parry the threat of colonial takeover. But they were taken up also to replace old systems of rule and social control that had become less effective as a result of social change and that could not satisfy the new demands of the market economy.