the brčko district was established after an arbitration process undertaken by the high representative for bosnia and herzegovina. according to the dayton peace accords however, the process could only arbitrate the disputed portion of the inter-entity boundary line (iebl). the brčko district was formed of the entire territory of the former brčko municipality, of which 48% (including brčko city) was in the new formed republika srpska, while 52% was in the old federation of bosnia and herzegovina. since the end of the bosnian war, the european union (eu) has maintained a diplomatic peace-keeping presence in the area.