Hi.
In my opinion, rather than being a set of solution-problem you have assumed in the first part of your outline is a chain of action-reaction.
Yes you can call Treaty of Versailles as a solution then after 2nd world war formation of UN can be categorized as a solution to the problem but others like disintegration of USSR, hegemony of USA and Uni polarity of world(imbalance of power) doesn't fit in solution-problem set.

This is my understanding, you may have another perspective in your mind.
But I would like to point out that it more seems like you are trying to create solutions from problems rather than problems from solutions.