Why is Thailand underdeveloped?

At least you spelled "underdeveloped" correctly. If by "underdevelopment" you mean a 3rd world country? Because Thailand is not a 3rd world country; the definition of a 3rd world country is "A country in which as been colonized".

Thailand has never been colonized therefore it is not a 3rd world country nor is it "underdeveloped.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.