Perceptions on Ethnicity, and on The Peoples of The World.

I am reading a very enlightening book, written by National Geographic, called 'Peoples of The World'. I purchased the book, because of its beauty, but I find, that the book has a wealth of information on the views of a Professor(former?) of Harvard University, Mr David Maybury-Lewis.I was enlightened, and humbly entertained by his very nice account in his writing of the piece, which is the introduction to the book, "Peoples of The World". He has come to the conclusion, in my humble opinion, that there may be infinite circumstances, which may give different groups of people, different ethnic identities. But in the forging of different ethnic identities, there is a common factor. That common factor is the goodwill among the people belonging to an ethnic identity, or any common identity. The Sikh community is a religious identity which is very inclusive, of other religious identities, but has one of the strongest individual religious identities. Perhaps the rule of forging strong individual group identities is, "The more amiable the group is among themselves, and the more amiable the group is towards other groups, the stronger is the identity of the group, among themselves, and the stronger is the identity of the group, in the hearts and minds of other groups.