Which historical event explains the large number of refugees to the united states arriving from bosnia-herzegovina, serbia, and montenegro from 1999 to 2001? a. unstable governments struggling with coastal piracy, militia groups, feuding warlords, and crumbling economies b. widespread famine caused by drought c. the break-up of yugoslavia into smaller independent nations d. the break-up of the soviet union into smaller independent nations

The most likely answer here would be C - the break-up of Yugoslavia into smaller indepent nations as this differentiation of the countries on the Balkans made them very vulnerable and people couldn't get jobs anywhere. The division of these nations happened somewhat earlier though, around five to ten years earlier. It could be they wanted to stay and see what happens with these countries and once they saw they cannot be saved they moved out of these countries to the US in hope for a better life. 

To be honest i thinks its between the first answer and the third answer