Not 100% sure but I'm pretty sure siam was one of the only ones to escape colonization. look at effects on neighbouring countries?
Sometime around 12,000 years ago, our hunter-gatherer ancestors began trying their hand at farming. First, they grew wild varieties of crops like peas, lentils and barley and herded wild animals like goats and wild oxen.
During the Age of Absolutism, several European monarchs intensified the power of their authority by emphasizing their divine right to rule and A) centralizing their power.
European monarchs clearly undrstood how powerful can get the local regional rulers. Considering the fact that they had armies and could always plot against the crown, monarchs had to do everything to prevent this from happening and establish all sources of power in the capital.