There's a very simple solution to your problem, which is to put the loop's code into a function. Your problem is that you overwrite the variable marker so that when it is accessed in the click event, it uses the latest version of that variable, which is the last marker you added.
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.