Does anyone know what offices would have looked like in the U.S. roughly between 1830-1860? In particular, did clerks and others work in a more open plan environment, or did people tend to have their own rooms in a building? If the former, I'm curious about what divided work spaces, and, if the latter, what the doors would have looked like (would names of positions be on plaques, absent, or on signs...etc.).
(FYI: I know the term White Collar didn't come into play until later in the century but I couldn't think of a better word!)