Trade is the only thing that can prevent another war.
As long as they're contempt and fed they won't start another mess. They love life and they love to eat. And if the country pulls itself out of the economic collapse that occured when Yugoslavia fell apart the chances of war will drastically fall down.
Whic wont occur untill the US and EU pull themselves out since all balkan states are dependant on outside trade. Anything else is just screwing your own population convincing that your diplomats are doing something right.
And keep the peacekeepers in. They're a small unbiased boost to local economies
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