Would it be possible to build cities underwater by the year 4000 if the polar ice sheets melted?

It's possible to build them underwater NOW; Jacques Cousteau and his team pioneered underwater habitats 40+ years ago, with teams of aquanauts who commuted between buildings by SCUBA and had their own submarine in an underwater hangar. There's no trick to it; it's just expensive Check the National Geographic Magazine archives for 1963 and 1965 to see photos of their five "ConShelf" stations.

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.