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| 1989, Sept.–1990, Dec |
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| Independence of Slovenia. On Sept. 27, the Slovenian Assembly adopted constitutional amendments declaring Slovenia “an independent, sovereign, and autonomous state” that had the right to veto any federal decision prejudicial to Slovenia's welfare. In July 1990, the Assembly proclaimed the full sovereignty of the Slovenian Republic, despite the opposition of the federal government and other republics. A referendum in Slovenia approved the declaration of independence on Dec. 23, 1990. | 1 |
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| 1990, Jan. 2 |
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| In response to slowed production and increased inflation, the government introduced new economic measures. | 2 |
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| Jan. 23 |
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| The Yugoslav League of Communists met and voted to relinquish the party's political monopoly. The Slovenian delegation demanded greater autonomy for the republics. | 3 |
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| Feb. 4 |
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| The Slovenian League of Communists declared itself independent from the Yugoslav Communist Party. | 4 |
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| May–Dec |
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| Formation of noncommunist governments: Lojze Peterle, chairman of the Slovene Christian Democratic Party, formed a new Slovenian government on May 16, after his party had won the election. Franjo Tudjman, leader of the Croatian Democratic Union (HDZ), was elected president of Croatia, and the government of Stjepan Mesic of the HDZ was approved on May 31. In December, noncommunist governments were also formed in Bosnia-Herzegovina and Macedonia. | 5 |
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| July 2 |
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| Rejecting the new constitutional proposals of Serbia, the Kosovo Assembly declared Kosovo independent of Serbia and a full constituent republic within the federation of Yugoslavia. In retaliation, Serbia permanently dissolved Kosovo's provincial assembly, took over its responsibilities, and terminated the contracts of all Kosovo parliamentary officials. | 6 |
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| July 17 |
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| The ruling Serbian Communist Party renamed itself the Serbian Socialist Party. | 7 |
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| Aug. 18 |
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| In Croatia the Serbian minority voted on an unofficial referendum for political autonomy. The government declared the ballot illegal. | 8 |
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| Oct. 1 |
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| Serbs in Croatia declared those areas where they were the majority “autonomous regions.” Violence occurred between police and residents. The government of Serbia called on the federal authorities to intervene to defend Serbs from what it called “repression in Croatia.” | 9 |
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| Oct. 3 |
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| The presidents of Slovenia and Croatia met in Zagreb to work together to obtain full autonomy from Yugoslavia. | 10 |
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| Oct. 30 |
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| Slovenia imposed customs duties on Serbian goods, effectively ending a unified Yugoslav internal market. | 11 |
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| Dec. 21 |
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| A new Croatian constitution proclaimed Croatia's sovereignty and its right to secede from Yugoslavia, though this was boycotted by ethnic Serbian deputies to the Croatian Assembly. | 12 |
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