<prompt> Kwakukhona ukwanda okuncane kakhulu kwedolobhana ngemuva kuka 1850 kuze kube ukukhula okukhulu ngasekupheleni kwawo-1970.  <response>: Yiqiniso, inguqulo eyinkimbinkimbi yomusho ithi Kwakungekho ukunwetshwa okuncane kakhulu kwedolobhana ngemuva kuka-1850 kuze kube ukukhula okukhulu ngasekupheleni kweminyaka yama-1970 okwaholela ekuvumelaneni okukhulu phakathi kwesakhiwo somlando kanye nokuphikisana okukhulu nokuthuthukiswa kwempi yangemva kwempi, okwenza ukuyekethisa okuncane kumlingiswa noma ukuhlelwa kwezakhiwo zangaphambili. 