Mezue ahịrịokwu na-esonụ: E mechara jikọta ya na ụlọ ọrụ na-ebipụta magazin na Pittsburgh na ndị isi akwụkwọ akụkọ na New Orleans, Louisiana. Ọ na-arụ ọrụ ụgbọ mmiri na Lower Mississippi River site na 1841 ruo 1847 na n'igwupụta ọlaedo na California na 1851. O nyere aka n'iwu ụlọ ọrụ Cambria Iron Works na Johnstown, Pennsylvania, n'afọ 1853, ọ rụkwara ọrụ n'ụlọ ọrụ ahụ ruo n'afọ 1861, mgbe ọ gbara arụkwaghịm. Campbell bụ onye nnọchiteanya na Nnọkọ Mba Republican nke mbụ na Philadelphia na
Afọ 1856.