Blame it on the British. They drew the boundaries...
That too, but it was a long time ago.
Germany was divided but they reunited again.
N & S.Korea will be reunited one day once the people
in the north can be convinced (woken up from their cultish
sleep) that it is the right move.
However, islam divides people, and muslims fight and kill
among themselves due to fundamental differences (sunni/shia/ahmadi/..),
the Arabs muslims in Sudan kill the African muslims there!
They are never happy in their homelands and are only happy
once they are in the West,but then they want to change the
rules in the West once they have settled down.