Why India have unity in diversity? why not other countries?

You can start with details about India . Like India is a land of diversity. Having different religions , cultures , languages , dialects , traits all in one nation/country .

While nation is defined as (wiki definition) land where people share common language , culture ethnicity. But india having so many different cultures , religions,languages with a large population is the largest working democracy. Unity of people lies in the common history .

That's something that unites Indian . Add up more on your own :P I can't think anymore hehe.

Start with a quote. For eg: “When there is no enemy within, the enemies outside cannot hurt you.”? Winston Churchill FOr more quotes on this topic see https://www.goodreads.com/quotes/tag/uni... You should say every great civilization has been inclusive - they have accepted different faith, different races, different cultures.

Such country is more colourful and stronger as the best practices get perpetuated. You can end with : As someone said India one country a million worlds.

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.