Easily China, which has experienced double digit annual growth the most during the period. The USA and UK were economic powerhouses by the 1965 and have had a smaller room for growth. Japan's miracle ended in the 1980s.
Brazil has been performing well since the turn of the millenium, but the last time it experienced consistent tremendous growth was in the 1970s.
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.