1931 (MCMXXXI) ebile ngwaga wa go thoma ka Labone, ngwaga wa bobedi ngwagengsome wa 1930s, ngwaga wa bomasometharo tee ngwagengkgolo wa Ngwagakgolo 20, le ngwaga wa bomakgolo senyane masometharo tee ngwagengkete wa Ngwagakete 2.