whoa! the OP was asking what if Siam didn't have it's colonial empire....why aren't you factoring in all the South Deccan expansions? or the Tamil Maritime Holdings ?
I suspect that, in the absence of Siam's influence, Europe is more likely to adopt a form of the caste system...which is good news for the Jews in Christendom.
Nah... Europeans didn´t come into contact with Siam until the late fifteenth century and by then castes had been dropped mostly.
But Siam did affect Europe in many ways though, especially when it came to philosophy and so on.
Vice versa of course. Those events mostly take place in the 16th century am I not correct.
But I must say, I applaud the effort Siam made against the indian caste system, although it in the end put India into the hands of their european competitors.