[MikelTackNailer]

The assembly line was extant during the American Civil War era and the expanding Industrial Revolution. Henry Ford refined it for maximum efficiency and profitability.

The vast Yankee legions were not kitted out from cottage industries like too many of the Rebs were.

[zeugma]

Yeah, the whole thing about interchangeable parts really got going at about the same time. that was one of the biggest innovations in industrial productions ever.