The Kazakh Soviet Socialist Republic (Kazakh: Қазақ Кеңестік Социалистік Республикасы, Qazaq Keñestik Socïalïstik Respwblïkası; Russian: Казахская Советская Социалистическая Республика, Kazakhskaya Sovetskaya Sotsialisticheskaya Respublika) abbreviated to KSSR (Russian: КССР, tr. KSSR), also known as the Kazakh SSR, was one of the constituent republics of the Soviet Union (USSR).
The country is named after the Kazakh people, Turkic-speaking former nomads who sustained a powerful khanate in the region before Russian and then Soviet domination. The Soviet Union's spaceport, now known as the Baikonur Cosmodrome, was located in this republic at Tyuratam, and the secret town of Leninsk (now known as Baikonur) was constructed to accommodate its personnel.
Established on August 26, 1920, it was initially called Kirghiz ASSR (Kirghiz Autonomous Soviet Socialist Republic) and was a part of the Russian SFSR. On April 15–19, 1925, it was renamed Kazak ASSR (subsequently Kazakh ASSR) and on December 5, 1936 it was elevated to the status of a Union-level republic, Kazakh SSR. During the 1950s and 1960s Soviet citizens were urged to settle in the Virgin Lands of the Kazakh Soviet Socialist Republic. The influx of immigrants, mostly Russians, skewed the ethnic mixture and enabled non-Kazakhs to outnumber natives. As a result, the use of the Kazakh language declined but has started to pick up again since independence, both as a result of its resurging popularity in law and business and the growing proportion of Kazakhs. The other nationalities included Ukrainians, Germans, Jews, Belarusians, Koreans and others; Germans at the time of independence formed about 8% of the population, the largest concentration of Germans in the entire Soviet Union. Independence has caused many of these newcomers to emigrate.
On December 10, 1991 the Kazakh SSR was renamed the Republic of Kazakhstan. It became independent on December 16, becoming the last republic to secede before the final collapse of the Soviet Union.
According to the 1897 census, the earliest census taken in the region, Kazakhs constituted 81.7% of the total population (3,392,751 people) within the territory of contemporary Kazakhstan. The Russian population in Kazakhstan was 454,402, or 10.95% of total population; there were 79,573 Ukrainians (1.91%); 55,984 Tatars (1.34%); 55,815 Uyghurs (1.34%); 29,564 Uzbeks (0.7%); 11,911 Mordovans (0.28%); 4,888 Dungan (0.11%); 2,883 Turkmen; 2,613 Germans; 2,528 Bashkir; 1,651 Jews; and 1,254 Poles.
Table: Ethnic Composition of Kazakhstan (census data)