It's better to ask why we humans stand divided as country state city religion caste school University profession and so on .. for we don't divide but divided to rule..
It helps to control populations and keep expenses down, when people migrate and rent or buy a property, it effects the interests and incomes of people, it increases
Because we are animals. Us and them is something you see all over the animal kingdom. There is also time of a civilization and religion playing a part.
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