Executive Summary: Research on civil war suggests there is a significant likelihood such conflicts will expand across international borders. This policy analysis examines four factors that contribute to this phenomenon and considers potential solutions for each. One of them, the unregulated flow of refugees into nearby states, is identified as a policy priority because of its potential to foment civil conflict in other territories. To contain civil war, this policy analysis recommends states prioritize safe and orderly travel conditions for refugees through bilateral or multilateral policy agreements. Recommended measures include monitoring and protecting travel corridors, easing restrictions on border crossings, issuing temporary visas, allowing freedom of movement, and providing financial support for associated costs.