Wanene ya nuna aikinsa a Amurka kadai? Bisa ga tambayar da ta gabata, ka rubuta mahallin da ke ɗauke da amsar. Zai iya zama jumla 1 - 20. Abubuwan da ke ciki:
A shekara ta 1893, George Westinghouse ya lashe kyautar don haskaka 1893 World's Columbian Exposition a Birnin Chicago tare da sauyawa na yanzu, ya ci nasara a kan General Electric ta dala miliyan daya. Wannan Nunin Duniya ya keɓe wani gini don nuna kayan lantarki. Ya kasance muhimmin abin da ya faru a cikin tarihin wutar lantarki na AC, kamar yadda Westinghouse ya nuna aminci, aminci, da kuma ingancin tsarin zamani mai sauyawa ga jama'ar Amurka. A baje kolin na Columbian, a karkashin wata alama da ke sanar da "Tsarin Polyphase na Tesla", Tesla ya nuna jerin tasirin lantarki da aka yi a baya a duk faɗin Amurka da Turai, ya haɗa da amfani da ƙarfin lantarki mai ƙarfi, mai saurin canzawa don haskaka fitilar fitar da iskar gas mara waya.:79 Wani mai kallo ya lura: