Charles Johnston, Travels in southern Abyssinia, Vol… (1844)
“ Neither Amhara, or Galla, had, as yet, appeared upon their naturally defended and very extensive fortress. In their social institutions the great principle of foreign policy, was the exclusion of strangers; and their isolated situation, easily enabled them to effect this. One character of civilization, the geography of the desert-surrounded table-lands of Africa, is eminently calculated to prosper and promote, that peculiar social condition, the consistency and continuance of which, requires little or no intercourse to be kept up with the rest of mankind ”
