The Socialist Federal Republic of Yugoslavia was an original Member of the United Nations, the Charter having been signed on its behalf on 26 June 1945 and ratified 19 October 1945, until its dissolution following the establishment and subsequent admission as new Members of Bosnia and Herzegovina, the Republic of Croatia, the Republic of Slovenia, The former Yugoslav Republic of Macedonia, and the Federal Republic of Yugoslavia.
The Republic of Croatia was admitted as a Member of the United Nations by General Assembly resolution of 22 May 1992.
The Republic of Bosnia and Herzegovina was admitted as a Member of the United Nations by General Assembly resolution of 22 May 1992.
The Republic of Slovenia was admitted as a Member of the United Nations by General Assembly resolution of 22 May 1992.
By resolution of 8 April 1993, the General Assembly decided to admit as a Member of the United Nations the State being provisionally referred to for all purposes within the United Nations as "The former Yugoslav Republic of Macedonia" pending settlement of the difference that had arisen over its name. Further to the communication dated 14 February 2019 from the Permanent Mission addressed to the Protocol and Liaison Service, the country name was changed to the Republic of North Macedonia (short form: North Macedonia) from the former name of The former Yugoslav Republic of Macedonia. Effective date: 14 February 2019.
The Federal Republic of Yugoslavia was admitted as a Member of the United Nations by General Assembly resolution of 1 November 2000.
On 4 February 2003, following the adoption and promulgation of the Constitutional Charter of Serbia and Montenegro by the Assembly of the Federal Republic of Yugoslavia, the official name of " Federal Republic of Yugoslavia" was changed to Serbia and Montenegro.
Montenegro held a 21 May 2006 referendum and declared itself independent from Serbia on 3 June.
In a letter dated 3 June 2006, the President of the Republic of Serbia informed the Secretary-General that the membership of Serbia and Montenegro was being continued by the Republic of Serbia, following Montenegro's declaration of independence.
On 28 June 2006 Montenegro was accepted as a United Nations Member State by General Assembly resolution .