One person or a group of people changing their form of government does not prove a cause and effect relationship.
That why it's just an example. Let's go down the list shall we. Since your indoctrination won't allow you to think critically.
Afghanistan
Democratic Republic of Afghanistan 27 April 1978 30 November 1987 9 years, 217 days.
Republic of Afghanistan 30 November 1987 28 April 1992 4 years, 150 days
Total 27 April 1978 28 April 1992 14 years, 1 day.
Albania
Democratic Government of Albania 29 November 1944 11 January 1946 1 year, 43 days.
People's Republic of Albania 11 January 1946 28 December 1976 30 years, 352 days
People's
Socialist Republic of Albania 28 December 1976 22 March 1992 15 years, 85 days
Total 29 November 1944 22 March 1992 47 years, 114 days.
Angola
People's Republic of Angola 11 November 1975 27 August 1992 16 years, 290 days.
Belarus Byelorussian
SSR Byelorussian Soviet Socialist Republic 31 July 1920 25 August 1991 70 years, 344 days.
Benin
People's Republic of Benin 30 November 1975 1 March 1990 14 years, 91 days.
Bulgaria People's Republic of Bulgaria 15 September 1946 7 December 1990 44 years, 83 days. Legally a socialist state from 1979 to 1989, ruled by a communist party from 1975 to 1989.
People's
Republic of Kampuchea 10 January 1979 1 May 1989 10 years, 111 days.Total 17 April 1975 1 May 1989 14 years, 14 days.
Congo-Brazzaville
People's Republic of the Congo 3 January 1970 15 March 1992 22 years, 72 days.
Czechoslovakia
Czechoslovak Republic 9 June 1948 11 July 1960 12 years, 32 days.
Czechoslovak
Socialist Republic 11 July 1960 29 March 1990 29 years, 261 days
Total 9 June 1948 29 March 1990 41 years, 293 days
Ethiopia
Provisional Military Government of Socialist Ethiopia 28 June 1974 22 February 1987 12 years, 239 days.
People's Democratic Republic of Ethiopia 22 February 1987 27 May 1991 4 years, 94 days
Total 28 June 1974 27 May 1991 16 years, 333 days.
East Germany German Democratic Republic 7 October 1949 3 October 1990 40 years, 361 days.
Hungary
People's Republic 20 August 1949 23 October 1989 40 years, 64 days.
North
Korea Democratic People's Republic of Korea 9 September 1948 19 February 1992
[14] 43 years, 163 days.
Mongolia Mongolian People's Republic 24 November 1924 12 February 1992 67 years, 80 days.
Mozambique People's Republic of Mozambique 25 June 1975 1 December 1990 15 years, 159 days.
Poland
Polish People's Republic 28 June 1945 30 December 1989 44 years, 185 days.
Romania
Romanian People's Republic 30 December 1947 21 August 1965 17 years, 234 days.
Socialist Republic of Romania 21 August 1965 30 December 1989 24 years, 131 days.
Total 30 December 1947 30 December 1989 42 years, 0 days.
Somalia
Somali Democratic Republic 21 October 1969 26 January 1991 21 years, 97 days.
Russian SFSR/
Soviet Union Russian Soviet Federative Socialist Republic 9 November 1917 30 December 1922 5 years, 51 days.
Union of Soviet Socialist Republics 30 December 1922 26 December 1991 68 years, 361 days
Total 9 November 1917 26 December 1991 74 years, 47 days.
Ukraine
SSR Ukrainian Soviet Socialist Republic 10 March 1919 24 August 1991 72 years, 167 days.
North
Vietnam Democratic Republic of Vietnam 2 September 1945 2 July 1976 30 years, 304 days.
South
Yemen People's Republic of South Yemen 30 November 1967 1 December 1970 3 years, 1 day.
People's Democratic Republic of Yemen 1 December 1970 22 May 1990 19 years, 172 days
Total 30 November 1967 22 May 1990 22 years, 173 days.
Yugoslavia
Democratic Federal Yugoslavia 29 November 1943 29 November 1945 2 years, 0 days.
Federal People's Republic of Yugoslavia 29 November 1945 7 April 1963 17 years, 129 days.
Socialist
Federal Republic of Yugoslavia 7 April 1963 27 April 1992 29 years, 20 days. November 1943 27 April 1992 48 years, 150 days
So where is the list of successful socialist majority countries that can show some evidence of a successful socialist country?