None. They are different romanization methods of writing Chinese: Wade-Giles ( Tai Chi Chuan, Chi Kung, Hsing-I, Pa Qua Chang, etc) and Pinyin (Taijiquan, Qigong, Xing-Yi, Baqua Zhang, Etc.). Initially Wage-Giles was more used in the West, but recently Pinyin, which is used in teaching Mandarin, is increasing in use.
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.