Is it okay to write a hub in other languages? Or will this somehow affect my Google Adsense?

No. It clearly states in the FAQ that hubs must be written in English. However, that's at present, but may expand into other languages further down the line.

Google won't mind other language hubs. Google adsense can be combined with content in almost any language. However hubpages decided to make a one language site: English.

They probably decided that for reasons of spam management. So Nick is right: you can't because it's against the hubpages TOS.

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.