They know both languages but cantonese is a dialect which is another form of chinese. The writings are nearly the same. Hong Kong and macau use traditional chinese characters while the rest of China use simplified chinese.
And cantonese is the mother or local language of guangdong people. I born in hong kong and I can speak and write both cantonese and mandarin but I prefer to use cantonese as my first language at home because I like the majority of guangdong people more fluent in the cantonese language. The other yahoo users who posted above me are right, as there are more people coming from other china's provinces, mandarin is the common language.
Hope this helps. More.
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.