Kings ruled with absolute power which let the poor stay poor and the rich stay rich
It was the turning point where the German troops failed defeat the Soviet Union
The rainy day is a symbol of life. The idea behind it is that life is like a rainy day because rain represents bad things that happens to you. The poem points out that we shouldn't be miserable because of it because even when there's rain, there's always sunshine behind it so just keep calm and carry on with life and things will get better.