Ná ngwụsị nke narị afọ nke 19, Allegheny, Pennsylvania (nke Pittsburgh sonyeere mgbe e mesịrị), ghọrọ obodo a ma ama n'ihi ụlọ ndị mara mma, bụ́ ndị ụfọdụ n'ime ezinụlọ ndị bara ọgaranya bi n'ógbè ahụ. A bịara mara otu n'ime ógbè ndị dị otú ahụ dị ka Okporo Ámá Agha Mexico. Ọ malitere site n'ala nke William Robinson Jr., onye bụbu onye isi obodo obodo Allegheny, onye kewara ala ahụ n'okporo ámá na ọtụtụ n'afọ 1847. Alexander Hays mere nnyocha maka mmepe ahụ. A na-akpọ ọtụtụ n'okporo ámá aha agha na ndị ọchịagha nke agha Mexico na America, gụnyere Buena Vista Street, Monterey Street, Palo Alto
Street, Resaca Place, Sherman Avenue, na Taylor Avenue. A kpọrọ Fremont Street (nke a na-akpọ Brighton Place ugbu a) iji sọpụrụ John C. Frémont.