1920 Azerbaijan is added to the Soviet Union.
1937 Stalinists execute Pastor Paul Hamberg and seven members of Azerbaijan's Lutheran community.
1991 Azerbaijan declares independence from USSR.
1992 Khojaly massacre: about 613 civilians are killed by Armenian armed forces during the conflict in Nagorno-Karabakh region of Azerbaijan
1992 Armenia, Azerbaijan, Kazakhstan, Kyrgyzstan, Moldova, San Marino, Tajikistan, Turkmenistan and Uzbekistan join the United Nations.
1994 The signing of the Bishkek Protocol between Armenia and Azerbaijan effectively freezes the Nagorno-Karabakh conflict.
2005 Azerbaijan Airlines Flight 217 from Baku, Azerbaijan, to Aktau, Kazakhstan crashes shortly after takeoff killing 23 people.