The answer is:
1.) Russian second front against Germany.
2.) German post war division.
3.) Soviet assistance against japan.
4.)Post war international organization.
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I hope this helps :D
Shell shock is basically PTSD and it was thought to be caused by soldiers being exposed to explodeing shells
The division of korea to north and south korea.
Railroads on the Railways required tracks for the trains to run on them these tracks earlier made up of iron for its heavy duty but soon enough realise that iron was not a very good option for tracks. Meaning drawbacks of using iron for example rusting is it was realised that Steel was a better option in making railroads.
Steel being made out of iron is heavy duty material yet it is not much prone to rusting. Just addition of certain minerals and carbon in iron steel forging is done making it heavy duty material.
Should be Mekong, because nations like Thailand, Vietnam all have the Mekong running through it
