1820 (MDCCCXX) ebile ngwagamolele wa go thoma ka Mokibelo, ngwaga wa pele ngwagengsome wa 1820s, ngwaga wa bomasomepedi ngwagengkgolo wa Ngwagakgolo 19, le ngwaga wa bomakgolo seswai masomepedi ngwagengkete wa Ngwagakete 2.