Until nineteen ninety-one, fifteen republics made up the Soviet Union.
In December nineteen twenty-two, Byelorussia, Transcaucasia, Russia and Ukraine were the four founding republics that signed a treaty creating the USSR. During the nineteen twenty-four national demarcation, Turkmenistan and Uzbekistan were formed from parts of Russia’s Turkestan and two Soviet dependencies: Bukharan, and Khorezm. Five years later, Tajikistan was divided from Uzbekistan, and, Transcaucasian dissolved with the constitution of nineteen thirty-six, resulting in the elevation of its constituent republics of Georgia, Azerbaijan and Armenia to Union Republics, while Kazakhstan and Kirghizia were split off from Russian.
In nineteen forty, Moldavia was formed from parts of the Northern Bukovina, Ukraine and Bessarabia, while Lithuania, Latvia and Estonia were also admitted into the union, which generally, wasn’t recognized by most members of the international community and frowned upon as an illegal occupation.
