Sojourners Magazine: The war between Armenia and Azerbaijan was an avoidable tragedy. The disputed Nagorno-Karabakh region has been populated since at least the second century B.C.E. by Armenians, one of the world’s oldest Christian civilizations. The  Muslim Azeris and others have lived there and in neighboring areas for centuries as  well, and the region was ethnically mixed (albeit majority Armenian) when the Soviet Union collapsed in 1991…