In period from 1991 till 1998 in Podunavlje there was self-proclaimed Eastern Slavonia , Baranja and Western Syrmia that was reintegrated into Croatia after signing of Erdut Agreement . Region was declared by local Serbs who promoted survival of Yugoslavia , because of which they had support of Yugoslav People 's Army . Local Serb population was further alarmed with comparisons of new Croatian state with World War II Independent State of Croatia and its Jasenovac concentration camp . War has left a heavy mark on both the economy and the interpersonal relationships in region . There were especially strained relations between two largest groups , Croats and Serbs . Some of the most important events of war in eastern Croatia are Battle of Vukovar , Vukovar massacre , and Borovo Selo killings in which in first two cases was killed significant number of civilians . Large part of Croats were forced to leave their homes in Eastern Slavonia , Baranja and Western Syrmia , and their property was looted and destroyed . Some have been captured and imprisoned for some time in Serbia , and some were killed there . Tens of thousands of Croats in this period left Podunavlje . At the same time in Podunavlje came tens of thousands Serbian refugees fleeing from war in the rest of Croatia . After the war ended local population get a difficult task of rebuilding coexistence in which were included a number of organizations such as the Organization for Security and Co-operation in Europe and embassies of foreign countries . However , although progress is slow at times international community has assessed this process as relatively successful
Vukovar massacre
Vukovar massacre
Podunavlje