Why Do Armenia And Azerbaijan Hate Each Other?

For decades, Azerbaijan and Armenia have had hostile relations over the disputed Nagorno-Karabakh region. So how did the conflict start?

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Nagorno-Karabakh profile (bbc.com)
"The landlocked mountainous region of Nagorno-Karabakh is the subject of an unresolved dispute between Azerbaijan, in which it lies, and its ethnic Armenian majority, backed by neighbouring Armenia."

The conflict in Nagorno-Karabakh (economist.com)
"FEW NOTICED when intense fighting broke out in early April in Nagorno-Karabakh, a disputed enclave between Armenia and Azerbaijan."

Amid Ethnic Conflict in Nagorno-Karabakh, an Oasis Thrives (nytimes.com)
"On a crystalline spring morning, Iosif Adamyan sipped coffee on the veranda of his guesthouse, overlooking a pear orchard in bloom and, in the distance, a range of snowy mountains."

Stalin's Legacy: The Nagorno-Karabakh Conflict (adst.org)
"Nagorno-Karabakh is a highly contested, landlocked region in the South Caucasus of the former Soviet Union."