Rubuta ci gaba don wannan sakin layi - Arias ya sami kyautar Nobel ta Zaman Lafiya ta 1987 tare da taimakon John Biehl, takwaransa a Ingila, da Rodrigo Madrigal Nieto don aikinsa na sanya hannu kan yarjejeniyar Esquipulas II. Wannan wani shiri ne da aka tsara don inganta dimokiradiyya da zaman lafiya a kan tsakiya na Amurka a lokacin babban rikici: 'yan bindiga na hagu suna fada da gwamnatoci a El Salvador
da Guatemala, wanda Amurka ta tallafawa a karkashin kulawar Yakin Cacar Baki; da Contras, wanda Amurka ta goyi baya, suna gwagwarmayar tayar da kayar baya ga gwamnatin Sandinista a Nicaragua; Honduras, kwanan nan da ke karɓar ikon siyasa daga sojojinta, an kama shi a tsakiya a matsayin tushen sojojin Amurka; kuma a kan iyakar Costa Rica, Panama ta fuskanci zalunci na mulkin soja na Manuel Noriega. Tare da goyon bayan Arias, rikice-rikicen makamai daban-daban sun ƙare a cikin shekaru goma (yaƙin basasa na Guatemala ya ƙare a ƙarshe a 1996).