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In 1914, a political assassination in Sarajevo set off a chain of events that led to the outbreak of World War I. As more and more young men were sent down into the trenches, influential voices in the United States and Britain began calling for the establishment of a permanent international body to maintain peace in the postwar world.
In liberated territories, the Partisans organised People's Committees to act as civilian government. The Anti-Fascist Council of National Liberation of Yugoslavia (AVNOJ) convened in Bihać on 26–27 November 1942.
On 14 May, he dispatched a telegram to the supreme headquarters Slovene Partisan Army prohibiting the execution of prisoners of war and commanding the transfer of the possible suspects to a military court.
On 28 June, the other member countries of the Cominform expelled Yugoslavia, citing "nationalist elements" that had "managed in the course of the past five or six months to reach a dominant position in the leadership" of the CPY.
On 26 June 1950, the National Assembly supported a crucial bill written by Milovan Đilas and Tito regarding "self-management", a type of cooperative independent socialist experiment that introduced profit sharing and workplace democracy in previously state-run enterprises, which then became the direct social ownership of the employees.
In the First multi-party election in Bosnia and Herzegovina, in November 1990, votes were cast largely according to ethnicity, leading to the success of the Bosniak Party of Democratic Action, the Serbian Democratic Party and the Croatian Democratic Union.
On 15 May, Stjepan Mesić, a Croat, was scheduled to be the chairman of the rotating presidency of Yugoslavia. Serbia, aided by Kosovo, Montenegro, and Vojvodina, whose presidency votes were at that time under Serbian control, blocked the appointment, which was otherwise seen as largely ceremonial.
On 18 November 1991, the Croatian Community of Herzeg-Bosnia was established in Mostar. Mate Boban was chosen as its president. Its founding document said: "The Community will respect the democratically elected government of the Republic of Bosnia and Herzegovina for as long as exists the state independence of Bosnia and Herzegovina in relation to the former, or any other, Yugoslavia".
The Bosnian Serb assembly members advised Serbs to boycott the referendums held on 29 February and 1 March 1992. The turnout to the referendums was reported as 63.7%, with 92.7% of voters voting in favour of independence (implying that Bosnian Serbs, which made up approximately 34% of the population, largely boycotted the referendum).
on 28 March 1992, Izetbegović, after meeting with the then-US ambassador to Yugoslavia Warren Zimmermann in Sarajevo, withdrew his signature and declared his opposition to any type of ethnic division of Bosnia.
On 15 May 1992, a JNA column was ambushed in Tuzla. 92nd Motorised JNA Brigade (stationed in "Husinska buna" barracks in Tuzla) received orders to leave the city of Tuzla and Bosnia-Herzegovina, and to enter Serbia.
The Army of Republika Srpska was newly established and put under the command of General Ratko Mladić, in a new phase of the war. Shelling on Sarajevo on 24, 26, 28 and 29 May were attributed to Mladić by UN Secretary-General Boutros Boutros-Ghali.
In 1992, the Croat-Bosniak conflict erupted in Bosnia and Herzegovina, just as each was fighting with the Bosnian Serbs. The war was originally fought between the Croatian Defense Council and Croatian volunteer troops on one side and the Army of the Republic of Bosnia and Herzegovina (ARBiH) on the other, but by 1994, the Croatian Army had an estimated 3,000 to 5,000 troops involved in the fighting.
On 7 January 1993, Orthodox Christmas Day, 8th Operational Unit Srebrenica, a unit of the ARBiH under the command of Bratunac Killings, attacked the village of Kravica near Bratunac. 46 Serbs died in the attack: 35 soldiers and 11 civilians.
By 26 January, the ARBiH seized control of several villages in the area, including Kaćuni and Bilalovac on the Busovača–Kiseljak road, thus isolating Kiseljak from Busovača. In the Kiseljak area, the ARBiH secured the villages northeast of the town of Kiseljak, but most of the municipality and the town itself remained in HVO control.
On 30 January, ARBiH and HVO leaders met in Vitez, together with representatives from UNPROFOR and other foreign observers, and signed a ceasefire in the area of central Bosnia, which came into effect on the following day.
On 22 February 1993, the United Nations Security Council passed Resolution 808 that decided "that an international tribunal shall be established for the prosecution of persons responsible for serious violations of international humanitarian law".
The April incidents escalated into an armed conflict on 15 April in the area of Vitez, Busovača, Kiseljak and Zenica. The outnumbered HVO in the Zenica municipality was quickly defeated, followed by a large exodus of Croat civilians.
On 16 April, the HVO (The Croatian Defence Council) launched a spoiling attack on the village of Ahmići, east of Vitez. After the attacking units breached the ARBiH lines and entered the village, groups of irregular HVO units went from house to house, burning them and killing civilians.