Should you not make it into Medical School, majoring in Biology will require at least a Master Degree. However, majoring in Chemistry, if it is ACS Certified, will open some doors to you with just a Bachelor Degree. Better yet is to major in Biochemistry.
Both subjects carry weight. If you want to be doctor ,try Biology.
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.