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The Nagorno-Karabakh Autonomous Oblast voted to secede from Azerbaijan and join Armenia, triggering the First Nagorno-Karabakh War.

Historical image related to The Nagorno-Karabakh Autonomous Oblast voted to secede from Azerbaijan and join Armenia, triggering the First Nagorno-Karabakh War. from February 20, 1988

Nagorno-Karabakh Autonomous Oblast

Region in the Azerbaijan SSR (1923–1991)

The Nagorno-Karabakh Autonomous Oblast (NKAO) was an autonomous oblast within the Azerbaijan Soviet Socialist Republic that was created on July 7, 1923. Its capital was the city of Stepanakert. The majority of the population were ethnic Armenians.
Source: Wikipedia (CC BY-SA)

First Nagorno-Karabakh War

Conflict between Armenia and Azerbaijan (1988–1994)

The First Nagorno-Karabakh War was an ethnic and territorial conflict that took place from February 1988 to May 1994, in the enclave of Nagorno-Karabakh in southwestern Azerbaijan, between the majority ethnic Armenians of Nagorno-Karabakh backed by Armenia, and the Republic of…
Source: Wikipedia (CC BY-SA)