N'ime ihe ndị a, olee nke ndị ọkà mmụta banyere ala na-adịghị amụ banyere ya: nkume, England, ma ọ bụ ugwu? N'iburu ajụjụ nke mbụ n'uche, dee ihe gbara ya gburugburu bụ́ nke ga-enye azịza ya. Ọ nwere ike ịbụ 1 - 20 ahịrịokwu. Ihe ndị gbara ya gburugburu:
Ọ bụ William Maclure mere map mbụ nke United States n'afọ 1809. N'afọ 1807, Maclure malitere ọrụ o ji aka ya rụọ nke bụ́ ime nnyocha banyere mbara ala na United States. Ọ fọrọ obere ka ọ bụrụ na ọ gafere steeti niile dị n'Amerịka ma depụta ha na map. Ọ gafere Ugwu Allegheny ugboro iri ise. E zigara nsonaazụ nke ọrụ ya na-enweghị enyemaka na American Philosophical Society na akwụkwọ ncheta nke akpọrọ Observations on the Geology of the United States nke na-akọwa Map Geological, ma bipụtara ya na Society's Transactions, tinyere mba mbụ nke map geological. Nke a dị afọ isii tupu William Smith emepụta map mbara ala nke England, ọ bụ ezie na e ji ụdị okwute dị iche wuo ya.