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After Armenia lost its independence to the Bolsheviks, Yerganian went to Tbilisi where he and Misak Grigorian were assigned to assassinate former Prime Minister of the Democratic Republic of Azerbaijan Fatali Khan Khoyski and leader of the Musavat party Khan Mahmadov.
Archbishop Tourian, upon his arrival to deliver an invocation, ordered the removal of the red, blue, and orange Tricolor of Democratic Republic of Armenia (1918–1920) from the stage before he would step out on it.
After declaration of Democratic Republic of Armenia he was assigned to Paris Peace Conference as a member of the delegation of the Republic of Armenia, he become member of central executive of Armenian General Benevolent Union.
When the South Caucasus came under British occupation, Sir John Oliver Wardrop, British Chief Commissioner in the South Caucasus, decided that assigning the Erivan Governorate and the Kars Oblast to Democratic Republic of Armenia (DRA) and the Elisabethpol and Baku Governorates to the Azerbaijan Democratic Republic (ADR) would solve the region's outstanding disputes.