Why are Armenia and Azerbaijan fighting over the Nagorno-Karabakh region?

an image of Ghazanchetsots Cathedral in Nagarno-Karabakh, a disputed region between Armenia and Azerbaijan
Azerbaijan recently bombed and damaged Holy Savior Cathedral, also known as Ghazanchetsots, a revered site in the disputed region of Nagarno-Karabakh.
(Image credit: Aldo Pavan/Getty)

Since the end of September, hundreds of soldiers and civilians are thought to have been killed in a rapidly developing conflict between the rival Caucasus nations of Armenia and Azerbaijan. 

But why are they in conflict?

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Benjamin Plackett
Live Science Contributor

Benjamin is a freelance science journalist with nearly a decade of experience, based in Australia. His writing has featured in Live Science, Scientific American, Discover Magazine, Associated Press, USA Today, Wired, Engadget, Chemical & Engineering News, among others. Benjamin has a bachelor's degree in biology from Imperial College, London, and a master's degree in science journalism from New York University along with an advanced certificate in science, health and environmental reporting.