You are a deity and you are building a new Earth. In populating the Earth, you’ve decided that your creations (10 million of them) will start with altered memories of the past. Your 10 million people will believe that the land, the country, the traditions have always been there and they are part of a longer history and heritage, that they’ve had non existent childhoods and pasts. The planet’s geology, existing buildings, and memories... everything is carefully set to promote this.
Unlike current Earth, this Earth will only have One Nation.
Your original plan was that all 10 million will believe they are part of the same culture, one nation, one race, one version of history.
However, someone else suggests that this will make for a boring world and one where the full range of human potential (as brought about by different cultures, different races, different traditions, religions, ways of looking at the world) won’t be realized. They suggest you alter the memories and appearances so that you start with a multicultural rather than uni cultural society.
The rules are that once you set the ball in motion, you have to leave (you can watch but you can’t intervene).
So then what do you do?
Do you make the One Nation a multiracial and multicultural society at the start? One that starts with a tolerant consensus maybe (though there’s no guarantee it would last)?
Or do you just make everyone one culture, one religion, one tradition, one race?
Consider the advantages of multiculturalism vs homogeneity.
Please assume that human nature cannot be changed and use what you know about human nature from IRL history and personal observation.