Chimwe chinhu chikuru chakaitwa naArzú paaiva mutungamiri wenyika kwaiva kusainwa kwechibvumirano cherunyararo neboka revapanduki rinonzi Guatemalan National Revolutionary Unity, icho chakagumisa hondo yevagari vemuGuatemala yemakore 36
. Nhaurirano dzakanga dzichienderera mberi kubvira muna 1990, uye Arzú akavapa simba idzva rinokosha paakasangana neURNG muMexico musi waFebruary 26, 1996. Kumiswa kwehondo kwakatevera pana March 20, uye zvibvumirano zvakasiyana-siyana zvorugare zvakasainwa sezvo gore rakapfuurira. Musi waDecember 12, chibvumirano chokupinza URNG pamutemo chakasainwa muMadrid. Musi waDecember 18, Congress yakapa mutemo waibvumira kuti varwi varegererwe zvishoma, chibvumirano chokupedzisira chorugare rwakasimba uye rusingaperi chisati chasainwa musi waDecember 29.