On this date, the Kosovo offensive of the Central Powers against Serbia ended and resulted in the occupation of Serbia. Kosovo was split between Austrian and Bulgarian control, with the Bulgarian army occupying the eastern territories and the Austro-Hungarian forces occupying the western regions.5 On 12/01/1918 the Kingdom of Serbs, Croats and Slovenes, later Kingdom of Yugoslavia was established and Kosovo became a part of it.6 The governance of the state was vested in the Serbian dynasty of Karađorđević, which had previously held sway over the Kingdom of Serbia under the reign of Peter I from 1903, following the May Coup, onward.6 During this period, Kosovo was continued to be colonized by Serbians. Kosovar Albanians, as well as other Slavic minorities, were heavily discriminated against.2 On 04/06/1941 the Axis powers started their invasion of Yugoslavia in the context of World War II.7 As a result, Kosovo was controlled partly by Italian-controlled Albania, Germany and Bulgaria. In the following war years, ethnic tensions intensified further.8 On 11/29/1945, a government dominated by Tito and the communists was established (Petrovich 1947: 508-9, Van Dyke 1947: 375) and, the Socialist Federal Republic Yugoslavia was officially proclaimed.9 The Socialist Autonomous Province of Kosovo, commonly known as Kosovo, constituted one of the two autonomous provinces within the Socialist Republic of Serbia under the framework of Yugoslavia.10 Over the following years, the region attained different levels of autonomy, before their freedom was significantly reduced in 1989. The ethnic tensions in Kosovo only increased during the 1980s, while the Serbian effort to oppress the Albanian population grew. In July 1990, Kosovo Albanians declared the establishment of the Republic of Kosovo, proclaiming it as a sovereign and independent state in September 1992. Ibrahim Rugova was elected president in May 1992, in an election limited to Kosovo Albanians. Throughout its existence, the Republic of Kosovo was only officially recognized by Albania. By the mid-1990s, Kosovo Albanians grew increasingly discontented, as the status of Kosovo was unresolved in the Dayton Agreement of November 1995, which concluded the Bosnian War. By 1996, the Kosovo Liberation Army (KLA), an ethnic Albanian guerrilla paramilitary group advocating for Kosovo’s separation and the creation of a Greater Albania, had surpassed Rugova’s non-violent resistance movement and initiated attacks against the Yugoslav Army and Serbian police in Kosovo, leading to the Kosovo War.2 The War ended June 1999, the Yugoslav and Serb forces retreated, and the UN send peacekeeping missions to Kosovo.11 Per FH, for the years 1993 to 1999, the territory scores between 11 and 14 as not free, which we also interpret as not free. UN Security Council Resolution 1244 established the United Nations Interim Administration Mission in Kosovo (UNMIK), which formally assumed authority. Kosovo was administered by UNMIK, with gradually expanding self-government through the Provisional Institutions of Self-Government (established 2001). Sovereignty formally remained with Serbia under UNSC 1244, but in practice Serbia had no effective control. Per FH, for the years 1999 to 2001, the territory scores between 11 and 14 as not free, which we also interpret as not free. Per FH’s evaluation for 2002 and 2003, the territory scores from 9 to 10 as not free, which we categorize as rather not free. Per FH, for the rest of this regime period, the territory scores between 11 and 14 as not free, which we also interpret as not free.V-Dem starts treating Kosovo in their data in 1999 and LIED only in 2008. V-Dem’s PCLI indicates political liberties as somewhat present in 1999 and as present form 2000 onwards. V-Dem only starts to provide data for Kosovo in 1999 and LIED in 2008.