Kafin yakin duniya na 1 , ƙungiyar Michael the Brave, wanda ya yi mulki a kan manyan hukumomi guda uku tare da mutanen Romania (Wallachia, Transylvania da Moldavia) na ɗan gajeren lokaci, ^[79] an duba shi a cikin lokutan baya a matsayin madaidaicin Romaniya ta zamani. , wani labarin da aka yi gardama tare da lura da tsanani ta Nicolae Bălcescu.Wannan ka'idar ta zama abin nufi ga 'yan kishin kasa, da kuma wani abin da ya sanya sojojin Romania daban-daban suka cimma kasa daya ta Romania.^[80]A cikin 1918, a ƙarshen Yaƙin Duniya na ɗaya, ƙungiyar Romania tare da Bukovina ta sami ƙulla a cikin 1919 a cikin Yarjejeniyar Saint Germain, ^[81] kuma wasu daga cikin Allies sun amince da haɗin gwiwa tare da Bessarabia a 1920 ta hanyar yarjejeniyar Paris da ba a taɓa amincewa da ita ba. .^[82] A ranar 1 ga Disamba, Wakilan Romanians daga Transylvania sun kada kuri'a don haɗa Transylvania, Banat, Crișana da Maramureș tare da Romania ta Sanarwar Union of Alba Iulia.'Yan kasar Romania a yau suna bikin wannan a matsayin ranar babbar kungiya, wato ranar hutu ta kasa.Kalmar Romanian Romaniya Mare (Babba ko Babban Romania) tana nufin ƙasar Romania a lokacin tsaka-tsaki da kuma yankin ƙasar Romania a lokacin.A wancan lokacin, Romania ta sami mafi girman yankinta, kusan kilomita 300,000 ko 120,000 sq mi ^[83] ), gami da duk ƙasashen Romania mai tarihi.^[84] A yau, ra'ayin yana aiki a matsayin ka'idar jagora don haɗewar Romania da Moldova.