| 22 Jul 1940 |
Lithuania is declared a Socialist Republic of Councils in accordance with a declaration passed by the People's Seimas (Liaudies Seimas) on 21 Jul 1940, promulgated on 22 Jul 1940 (Labor Lithuania, No. 11, 22 Jul 1940, pp. 1-2; Government Gazette, No. 719, 22 Jul 1940, pp. 519-520) |
| 22 Jul 1940 - 11 Mar 1990 |
Lietuvos Tarybų Socialistinė Respublika = (to 18 Nov 1988) Litovskaja Sovetskaja Socialističeskaja Respublika (Литовская Советская Социалистическая Республика) | Lithuanian Soviet Socialist Republic |
| 22 Jul 1940 |
the Lithuanian SSR applied for accession to the Union of Soviet Socialist Republics in accordance with a declaration passed by the People's Seimas (Liaudies Seimas) on 21 Jul 1940, promulgated on 22 Jul 1940 Labor Lithuania, No. 11, 22 Jul 1940, pp. 1-2; Government Gazette, No. 719, 22 Jul 1940, pp. 520-521) |
| 3 Aug 1940 |
the Lithuanian SSR is admitted to the Union of Soviet Socialist Republics in accordance with a law passed by the Supreme Council (Verhovnjy Sovet | Верховный Совет) of the USSR on 3 Aug 1940 (USSR Supreme Council Proceedings 1940 – 7th Session, pp. 91-92, 186) |
| 18 Nov 1988 |
Lithuanian is recognized as the state language in accordance with the amendments to the Constitution of the Lithuanian SSR as contained in a law passed by the Supreme Council (Aukščiausioji Taryba) of the Lithuanian SSR on 18 Nov 1988 (Soviet Lithuania, No. 267, 19 Nov 1988, p. 1) |
| 18 May 1989 |
the precedence of laws of the Lithuanian SSR over the laws of the USSR is a) established in accordance with the amendments to the Constitution as contained in a law passed by the Supreme Council of the Lithuanian SSR on 18 May 1989 and b) proclaimed by a declaration of state sovereignty adopted by the Supreme Council on the same day (Soviet Lithuania, No. 116, 19 May 1989, p. 1) |
