 Nyora kupfuurira kweiyi ndima - United States Exploring Expedition18381842 yaive yekutsvaga uye yekuongorora rwendo rwePacific Ocean Maodzanyemba Makungwa yakaitwa neUnited States Navy kuti iwane zvakawanda nezvePacific Ocean nechiteshi chayo. Chikepe ichi chaiva nezvikepe zvishanu chakabvumirwa neCongress muna 1836. Dzimwe nguva inonzi Ex. Ex. kana kuti the Wilkes Expedition mukuremekedza mukuru mukuru weuto rake rakatevera, U.S. Navy Lt. Charles Wilkes 17981877. Rwendo urwu rwakanga rwuchikosha zvikuru mukukura kworuzivo rwomugungwa uye kugadzira mepu dzePacific. Ngarava mbiri idzi dzakarasika mutsaona - imwe paRwizi rweColumbia muna 1841. Kubva munharaunda yePortland yemazuva ano, Oregon, boka raifamba nomugungwa raitungamirirwa naGeorge F. Emmons rakarayirwa kuti rienderere mberi nomugwagwa womukati-kati kuenda kuSan Francisco Bay. Boka raEmmons iri rakaenda kumaodzanyemba richitevedza Siskiyou Trail, kusanganisira Rwizi Sacramento, zvichiita kuti kushanya kwokutanga kwakanyoreswa nevaAmerica uye kucherechedzwa kwesainzi kweGomo reShasta, kuchamhembe kweCalifornia. Boka raEmmons rakabatanazve nengarava, idzo dzakanga dzaenda kumaodzanyemba, muSan Francisco Bay. Pashure pokudzoka kwavo Wilkes akabudisa mabasa makuru esayenzi Western America, including California and Oregon 1849 uye Theory of the Winds 1856. 