context: The Nagorno-Karabakh war was a conflict between the Armenian-populated Nagorno-Karabakh region between 1992 and 1994 [1]. It originated in 1988 after the Nagorno-Karabakh region voted to join Armenia in a referendum, which was not accepted by the then Azerbaijani Soviet Republic and the Soviet Union. [1]
question: What led to the Nagorno-Karabakh war?
answers.text: the Nagorno-Karabakh region voted to join Armenia in a referendum, which was not accepted by the then Azerbaijani Soviet Republic and the Soviet Union