According to Chiume, the border between the two countries was defined in the Heligoland Treaty signed by the former colonial powers Germany and Britain on 1st July 1890.
Kada huyo wa CCM alieleza kuwa Waoman walipewa ardhi baada ya mabeberu wa nchi za Ulaya kuigwa Afrika katika mkutano uliofanyika mjini Berlin huko Ujerumani mwaka 1884/1885 kinyume na hiari ya waafrika wenyewe wakiwemo Wazanzibari.