Ka cika wannan furcin: A ranar 1 ga Disamba, 1978, an amince da yankin da ke da tarihi kuma aka saka shi a cikin Tarihin Wuraren Tarihi na Ƙasa. An kuma amince da Birnin Waterloo saboda aikin da ya yi ta hanyar Sister Cities International. A ranar 2 ga Oktoba, 1980, Waterloo ya ba da sanarwar haɗin gwiwar Sister Cities (a hukumance an amince da Afrilu 1981) tare da Porta Westfalica a (sa'an nan) Jamus ta Yamma. Musamman saboda kokarin Vera Kohlmeier na Waterloo da Helmut Macke na Porta Westfalica, ya zo ne sakamakon binciken tarihin dangi, wanda ya kammala cewa watakila kashi biyu bisa uku na Jamusanci na Monroe County na iya gano kakanninsu zuwa wannan yanki na arewacin Jamus.Porta Westfalica kanta ta zo ne a 1973 a matsayin tarin ƙauyuka 15 a cikin birni na sama da 40,000. A bakin Kogin Weser a arewacin Jamus, Porta Westfalica tana cikin kwari tsakanin manyan duwatsu biyu. Tafiya ta manyan kungiyoyi yawanci yakan faru a kowace shekara biyu, ciki har da ziyarar da Waterloo Jamusanci Band da Bläserkreis, Porta ta 70-member matasa tagulla band. An kuma ba da gudummawar sadaka ga 'yan gudun hijirar Jamus ta Gabas da wadanda ke fama da tashin hankali na 1993
ambaliya. Wannan haɗin gwiwar, wanda ke tafiya ta hanyar Portaloo, tun daga lokacin ya taimaka wa sauran al'ummomi a yankin don kafa shirye-shiryen 'yan uwan' yan uwan kansu, ciki har da Columbia / Gedern, Belleville / Paderborn, da Millstadt / Groß-Bieberau. An karrama "Portaloo" da kyaututtuka bakwai na Readers Digest da ake so don shirin Sister Cities. Kowane bazara wannan birni yana gudanar da shi shekara-shekara "Porta Westfalica Fest" ko "PortaFest" don girmama 'yar'uwarta birni.