Transcaucasian Democratic Federative Republic in the context of "Caucasus campaign"

The First Republic of Armenia, officially known at the time of its existence as the Republic of Armenia, was an independent Armenian state that existed from May (28th de jure, 30th de facto) 1918 to 2 December 1920 in the Armenian-populated territories of the former Russian Empire known as Eastern or Russian Armenia. The republic was established in May 1918, with its capital in the city of Yerevan, after the dissolution of the short-lived Transcaucasian Federation. It was the first Armenian state since the Middle Ages.

In its first year of independence, Armenia was confined to a small territory around Lake Sevan after its invasion by the Ottoman Empire during the Caucasus campaign. Following the Armistice of Mudros, Armenia expanded its borders in the wake of the Ottoman withdrawal, leading to a brief border war with neighbouring Georgia. During its first winter, hundreds of thousands of refugees in the country who had fled the Armenian genocide died from starvation or exposure. In the spring of 1919, Armenia, with British support, incorporated the formerly occupied regions of Kars and Nakhchivan, thereby tripling in size since independence; however, Armenian control of these regions collapsed during the Muslim uprisings that erupted in the summer of 1919.

Ganja (/ˈɡændʒə/; Azerbaijani: Gəncə [ɟænˈdʒæ] ) is Azerbaijan's second largest city, with a population of around 335,600. The city has been a historic and cultural center throughout most of its existence. It was the capital of the Ganja Khanate until 1804; after Qajar Iran ceded it to the Russian Empire following the Treaty of Gulistan in 1813, it became part of the administrative divisions of the Georgia Governorate, Georgia-Imeretia Governorate, Tiflis Governorate, and Elizavetpol Governorate. Following the dissolution of the Russian Empire and the Transcaucasian Democratic Federative Republic, it became a part of the Azerbaijan Democratic Republic, followed by Azerbaijan SSR, and, since 1991, the Republic of Azerbaijan.

The Azerbaijan Democratic Republic (Azerbaijani: Azərbaycan Demokratik Cümhuriyyəti), also known as the Azerbaijan People's Republic (Azerbaijani: Azərbaycan Xalq Cümhuriyyəti; آذربایجان خلق جمهوریتی‎), was the first secular democratic republic in the Turkic and Muslim worlds. The ADR was founded by the Azerbaijani National Council in Tiflis on 28 May 1918 after the collapse of the Transcaucasian Democratic Federative Republic, and ceased to exist on 28 April 1920. Its established borders were with Russia to the north, the Democratic Republic of Georgia to the north-west, the Republic of Armenia to the west, and Iran to the south. It had a population of around 3 million. Ganja was the temporary capital of the Republic as Baku was under Bolshevik control.

Under the ADR, a government system was developed in which a Parliament elected on the basis of universal, free, and proportionate representation was the supreme organ of state authority; the Council of Ministers was held responsible before it. Fatali Khan Khoyski became its first prime minister. Besides the Musavat majority, Ahrar, Ittihad, Muslim Social Democrats as well as representatives of Armenian (21 out of 120 seats), Russian, Polish, German, and Jewish minorities gained seats in the parliament. Many members supported Pan-Islamist and Pan-Turkist ideas.

The Armeno-Georgian War was a short border dispute that was fought in December 1918 between the newly independent Democratic Republic of Georgia and the First Republic of Armenia, largely over the control of former districts of the Tiflis Governorate, in Borchaly (Lori) and Akhalkalaki.

In May 1918, towards the end of World War I, Armenia and Georgia both declared their independence, dissolving the short-lived union between them. Both Georgia and Armenia claimed Lori and Akhalkalaki, both of which were populated primarily by Armenians. The border dispute turned into an open military conflict on 7 December 1918. Armenian forces initiated coup de mains that brought them within 10 kilometers of the Georgian capital, Tiflis, before Georgian troops were able to organize counterattacks. Allied intervention forced a ceasefire. Battles continued until the ceasefire came into effect at midnight on December 31.