Poland, is the first country because they had wanted to get through Europe without being in too much conflict
That would be a direct democracy. All adult male citizens attending the assembly could vote on the issues proposed at the time.
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.