The expansionist desires of Serbia and the existence of people of multiple ethnicities in the small geographical area contributed to the conflicts there.
Explanation:
The populations of Herzegovina and Bosnia were constituted by the people of ethnicities having contradictory beliefs and ways of thinking.
Also, people of each ethnicity believed that their dominance over the region is a must so as to protect their interests.
The Serbs kept trying to expand their rule and that led to increased conflicts in the regions.
