The first countries to have flags were countries of ancient China that later were united into modern China. What one can say is that the first flags were in China. The similarity of the three flags you mentioned has historical rational.
All three derive from the flag of the United Provinces of Central America. That flag was adopted when the country formed in 1822, and in turn was based on the Argentinian flag because Argentina had sent an expeditionary force to help the Central Americans rebel against the Spanish. The United Provinces broke up in 1838; but, three of its five countries eventually chose flags derived from its flag.
According to Flagspot. Net, the country credited with first use of a flag is the Netherlands in 1569 (although I would assume that flags were used by tribes, kingdoms, etc long before then). Not sure about the second part of your question.
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.