The gas in question is CO2. It extinguishes flames and it is denser than air, so it stayed inside the tank instead of floating away like water vapor would. CO2 is also a product of the reaction between baking soda and vinegar (acetic acid).
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.