Before revision:  I show that the risk of externalization increases the likelihood of a peaceful outcome, but only if the government is sufficiently powerful relative to the rebels, and if the risk of externalization is sufficiently high  .
After revision:  I show that the risk of externalization increases the likelihood of a peaceful outcome, but only if the government is sufficiently powerful relative to the rebels, and if the risk of externalization is sufficiently high , and the foreign actor who can intervene in the domestic conflict is sufficiently uninterested in material costs and benefits .