Dissolution of the Soviet Union (1991) – multiple Soviet Socialist Republics (SSRs) declared independence from the USSR.
Armenia – the Armenian SSR became the Republic of Armenia following the Declaration of Independence of Armenia.
Azerbaijan – the Azerbaijan SSR became the Republic of Azerbaijan.
Belarus – the Byelorussian SSR became the Republic of Belarus following its Declaration of State Sovereignty.
Estonia – Estonian SSR became the Republic of Estonia.
Georgia – The Georgian SSR became the Republic of Georgia.
Kazakhstan – the Kazakh SSR became the Republic of Kazakhstan.
Kyrgyzstan – the Kirghiz SSR became the Republic of Kyrgyzstan.
Latvia – the Latvian SSR became the Republic of Latvia.
Lithuania – the Lithuanian SSR became the Republic of Lithuania
Moldova – the Moldavian SSR became the Republic of Moldova.
Tajikistan – the Tajik SSR became the Republic of Tajikistan.
Turkmenistan – the Turkmen SSR became the Republic of Turkmenistan.
Ukraine – the Ukrainian SSR became the Republic of Ukraine
Uzbekistan – the Uzbek SSR became the Republic of Uzbekistan.
https://en.wikipedia.org/wiki/Dissolution_of_the_Soviet_Union