Every 28 May is Republic Day in Azerbaijan. This holiday’s basis dates back to 1918, but it wasn’t celebrated officially during the time Azerbaijan was controlled by the USSR.
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In essence then, Republic Day wasn’t celebrated at all until after independence from the USSR in 1991, at which point it was quickly instituted.
After the collapse of the Russia’s war effort in 1917, during World War I, Russia left the war. But they had done better on the Caucasus Front than in Eastern Europe, and they intended to keep all gains made there, including their conquest of what is today Azerbaijan.
At first, a “Transcaucasia” union under Russian control was attempted, but soon, Azerbaijan rebelled. Then the Russian Civil War between “Red” and “White” Russia commenced. That slowed down the re-conquest of Azerbaijan a bit, but sure enough, the USSR took it over again as soon as possible.
The Aizerbaijani Republic of 1918 was short-lived (only 23 months), but it was the first democratic-style republic in a Muslim land.
Today, Azerbaijan celebrates Republic Day with great fanfare. The Azerbaijani flag is put on display everywhere, and the president and other officials preside over an official flag raising ceremony in Baku, the capital city. The flat is hoisted before a guard of honour and right at the presidential palace.