When Yugoslavia broke up into different countries, which one experienced the greatest losses due to ethnic cleansing?

Bosnia and Herzegovina

Explanation:

During the war in the aftermath of the breakup of Yugoslavia, there were many ethnic conflicts. All sides that lived together beforehand would attack one another based on nationality and region. There were many victims and death within all communities, but the Republic of Bosnia and Herzegovina had probably the biggest losses. This was due to systematic ethnic cleansing carried out by the Serbian army and nationalists.

Serbian nationalistic government was set to get the territory for themselves and Bosnian Serbs. Because of this, both Bosnian Muslims and Bosnian Croats were the targets of the cleansing and there were numberless massacres and killings of these groups. The Srebrenica massacre was later proclaimed to be genocide - more than 8000 men and boys were killed in the attempt to systematically cleanse the area.

In total, there are probably over 100 000 people who were murdered and killed in Bosnia during the war, 14000 only in Sarajevo, the capital.